[AST] Revert mangling changes from r339428

As discussed in https://reviews.llvm.org/D50144, we want Obj-C classes
to have the same mangling as C++ structs, to support headers like the
following:

```
@class I;
struct I;

void f(I *);
```

since the header can be used from both C++ and Obj-C++ TUs, and we want
a consistent mangling across the two to prevent link errors. Itanium
mangles both the same way, and so should the MS ABI.

The main concern with having the same mangling for C++ structs and Obj-C
classes was that we want to treat them differently for the purposes of
exception handling, e.g. we don't want a C++ catch statement for a
struct to be able to catch an Obj-C class with the same name as the
struct. We can accomplish this by mangling Obj-C class names differently
in their RTTI, which I'll do in a follow-up patch.

Differential Revision: https://reviews.llvm.org/D52581

5 files changed, 97 insertions, 99 deletions

diff --git a/clang/lib/AST/MicrosoftMangle.cpp b/clang/lib/AST/MicrosoftMangle.cpp
index 1d4bdaa760c..072184d82e8 100644
--- a/clang/lib/AST/MicrosoftMangle.cpp
+++ b/clang/lib/AST/MicrosoftMangle.cpp
@@ -482,7 +482,7 @@ void MicrosoftCXXNameMangler::mangle(const NamedDecl *D, StringRef Prefix) {
     mangleFunctionEncoding(FD, Context.shouldMangleDeclName(FD));
   else if (const VarDecl *VD = dyn_cast<VarDecl>(D))
     mangleVariableEncoding(VD);
-  else if (!isa<ObjCInterfaceDecl>(D))
+  else
     llvm_unreachable("Tried to mangle unexpected NamedDecl!");
 }
 
@@ -1951,13 +1951,13 @@ void MicrosoftCXXNameMangler::mangleType(const BuiltinType *T, Qualifiers,
     llvm_unreachable("placeholder types shouldn't get to name mangling");
 
   case BuiltinType::ObjCId:
-    mangleArtificalTagType(TTK_Struct, ".objc_object");
+    mangleArtificalTagType(TTK_Struct, "objc_object");
     break;
   case BuiltinType::ObjCClass:
-    mangleArtificalTagType(TTK_Struct, ".objc_class");
+    mangleArtificalTagType(TTK_Struct, "objc_class");
     break;
   case BuiltinType::ObjCSel:
-    mangleArtificalTagType(TTK_Struct, ".objc_selector");
+    mangleArtificalTagType(TTK_Struct, "objc_selector");
     break;
 
 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
@@ -2637,10 +2637,9 @@ void MicrosoftCXXNameMangler::mangleType(const DependentAddressSpaceType *T,
 
 void MicrosoftCXXNameMangler::mangleType(const ObjCInterfaceType *T, Qualifiers,
                                          SourceRange) {
-  // ObjC interfaces are mangled as if they were structs with a name that is
-  // not a valid C/C++ identifier
+  // ObjC interfaces have structs underlying them.
   mangleTagTypeKind(TTK_Struct);
-  mangle(T->getDecl(), ".objc_cls_");
+  mangleName(T->getDecl());
 }
 
 void MicrosoftCXXNameMangler::mangleType(const ObjCObjectType *T,
@@ -2661,11 +2660,11 @@ void MicrosoftCXXNameMangler::mangleType(const ObjCObjectType *T,
 
   Out << "?$";
   if (T->isObjCId())
-    mangleSourceName(".objc_object");
+    mangleSourceName("objc_object");
   else if (T->isObjCClass())
-    mangleSourceName(".objc_class");
+    mangleSourceName("objc_class");
   else
-    mangleSourceName((".objc_cls_" + T->getInterface()->getName()).str());
+    mangleSourceName(T->getInterface()->getName());
 
   for (const auto &Q : T->quals())
     mangleObjCProtocol(Q);
diff --git a/clang/test/CodeGenObjCXX/arc-marker-funclet.mm b/clang/test/CodeGenObjCXX/arc-marker-funclet.mm
index 6ad0acd6878..900c2788dae 100644
--- a/clang/test/CodeGenObjCXX/arc-marker-funclet.mm
+++ b/clang/test/CodeGenObjCXX/arc-marker-funclet.mm
@@ -10,7 +10,7 @@ void g() {
   }
 }
 
-// CHECK: call i8* @"?f@@YAPAU.objc_object@@XZ"() [ "funclet"(token %1) ]
+// CHECK: call i8* @"?f@@YAPAUobjc_object@@XZ"() [ "funclet"(token %1) ]
 // CHECK-NEXT: call void asm sideeffect "movl{{.*}}%ebp, %ebp{{.*}}", ""() [ "funclet"(token %1) ]
 
 // The corresponding f() call was invoked from the entry basic block.
diff --git a/clang/test/CodeGenObjCXX/microsoft-abi-arc-param-order.mm b/clang/test/CodeGenObjCXX/microsoft-abi-arc-param-order.mm
index 125f8821ef2..910a7db7340 100644
--- a/clang/test/CodeGenObjCXX/microsoft-abi-arc-param-order.mm
+++ b/clang/test/CodeGenObjCXX/microsoft-abi-arc-param-order.mm
@@ -9,7 +9,7 @@ struct A {
 
 // Verify that we destruct things from left to right in the MS C++ ABI: a, b, c, d.
 //
-// CHECK-LABEL: define dso_local void @"?test_arc_order@@YAXUA@@PAU.objc_object@@01@Z"
+// CHECK-LABEL: define dso_local void @"?test_arc_order@@YAXUA@@PAUobjc_object@@01@Z"
 // CHECK:                       (<{ %struct.A, i8*, %struct.A, i8* }>* inalloca)
 void test_arc_order(A a, id __attribute__((ns_consumed)) b , A c, id __attribute__((ns_consumed)) d) {
   // CHECK: call x86_thiscallcc void @"??1A@@QAE@XZ"(%struct.A* %{{.*}})
diff --git a/clang/test/CodeGenObjCXX/msabi-objc-extensions.mm b/clang/test/CodeGenObjCXX/msabi-objc-extensions.mm
index 52d5cd8271c..7ac3910ba47 100644
--- a/clang/test/CodeGenObjCXX/msabi-objc-extensions.mm
+++ b/clang/test/CodeGenObjCXX/msabi-objc-extensions.mm
@@ -7,92 +7,91 @@
 @class J<T>;
 
 void f(id<P>, id, id<P>, id) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_object@U?$Protocol@UP@@@__ObjC@@@@PAU.objc_object@@01@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$objc_object@U?$Protocol@UP@@@__ObjC@@@@PAUobjc_object@@01@Z"
 
 void f(id, id<P>, id<P>, id) {}
-// CHECK-LABEL: "?f@@YAXPAU.objc_object@@PAU?$.objc_object@U?$Protocol@UP@@@__ObjC@@@@10@Z"
+// CHECK-LABEL: "?f@@YAXPAUobjc_object@@PAU?$objc_object@U?$Protocol@UP@@@__ObjC@@@@10@Z"
 
 void f(id<P>, id<P>) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_object@U?$Protocol@UP@@@__ObjC@@@@0@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$objc_object@U?$Protocol@UP@@@__ObjC@@@@0@Z"
 
 void f(id<P>) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_object@U?$Protocol@UP@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$objc_object@U?$Protocol@UP@@@__ObjC@@@@@Z"
 
 void f(id<P, Q>) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_object@U?$Protocol@UP@@@__ObjC@@U?$Protocol@UQ@@@2@@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$objc_object@U?$Protocol@UP@@@__ObjC@@U?$Protocol@UQ@@@2@@@@Z"
 
 void f(Class<P>) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_class@U?$Protocol@UP@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$objc_class@U?$Protocol@UP@@@__ObjC@@@@@Z"
 
 void f(Class<P, Q>) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_class@U?$Protocol@UP@@@__ObjC@@U?$Protocol@UQ@@@2@@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$objc_class@U?$Protocol@UP@@@__ObjC@@U?$Protocol@UQ@@@2@@@@Z"
 
 void f(I<P> *) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_cls_I@U?$Protocol@UP@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$I@U?$Protocol@UP@@@__ObjC@@@@@Z"
 
 void f(I<P, Q> *) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_cls_I@U?$Protocol@UP@@@__ObjC@@U?$Protocol@UQ@@@2@@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$I@U?$Protocol@UP@@@__ObjC@@U?$Protocol@UQ@@@2@@@@Z"
 
 template <typename>
 struct S {};
 
 void f(S<__unsafe_unretained id>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@PAU.objc_object@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@PAUobjc_object@@@@@Z"
 
 void f(S<__autoreleasing id>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Autoreleasing@PAU.objc_object@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Autoreleasing@PAUobjc_object@@@__ObjC@@@@@Z"
 
 void f(S<__strong id>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAU.objc_object@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAUobjc_object@@@__ObjC@@@@@Z"
 
 void f(S<__weak id>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Weak@PAU.objc_object@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Weak@PAUobjc_object@@@__ObjC@@@@@Z"
 
 void w(__weak id) {}
-// CHECK-LABEL: "?w@@YAXPAU.objc_object@@@Z"
+// CHECK-LABEL: "?w@@YAXPAUobjc_object@@@Z"
 
 void s(__strong id) {}
-// CHECK-LABEL: "?s@@YAXPAU.objc_object@@@Z"
+// CHECK-LABEL: "?s@@YAXPAUobjc_object@@@Z"
 
 void a(__autoreleasing id) {}
-// CHECK-LABEL: "?a@@YAXPAU.objc_object@@@Z"
+// CHECK-LABEL: "?a@@YAXPAUobjc_object@@@Z"
 
 void u(__unsafe_unretained id) {}
-// CHECK-LABEL: "?u@@YAXPAU.objc_object@@@Z"
+// CHECK-LABEL: "?u@@YAXPAUobjc_object@@@Z"
 
 S<__autoreleasing id> g() { return S<__autoreleasing id>(); }
-// CHECK-LABEL: "?g@@YA?AU?$S@U?$Autoreleasing@PAU.objc_object@@@__ObjC@@@@XZ"
+// CHECK-LABEL: "?g@@YA?AU?$S@U?$Autoreleasing@PAUobjc_object@@@__ObjC@@@@XZ"
 
 __autoreleasing id h() { return nullptr; }
-// CHECK-LABEL: "?h@@YAPAU.objc_object@@XZ"
+// CHECK-LABEL: "?h@@YAPAUobjc_object@@XZ"
 
 void f(I *) {}
-// CHECK-LABEL: "?f@@YAXPAU.objc_cls_I@@@Z"
+// CHECK-LABEL: "?f@@YAXPAUI@@@Z"
 
 void f(__kindof I *) {}
-// CHECK-LABEL: "?f@@YAXPAU?$KindOf@U.objc_cls_I@@@__ObjC@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$KindOf@UI@@@__ObjC@@@Z"
 
 void f(__kindof I<P> *) {}
-// CHECK-LABEL: "?f@@YAXPAU?$KindOf@U?$.objc_cls_I@U?$Protocol@UP@@@__ObjC@@@@@__ObjC@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$KindOf@U?$I@U?$Protocol@UP@@@__ObjC@@@@@__ObjC@@@Z"
 
 void f(S<I *>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAU.objc_cls_I@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAUI@@@__ObjC@@@@@Z"
 
 void f(S<__kindof I *>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAU?$KindOf@U.objc_cls_I@@@__ObjC@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAU?$KindOf@UI@@@__ObjC@@@__ObjC@@@@@Z"
 
 void f(S<__kindof I<P> *>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAU?$KindOf@U?$.objc_cls_I@U?$Protocol@UP@@@__ObjC@@@@@__ObjC@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Strong@PAU?$KindOf@U?$I@U?$Protocol@UP@@@__ObjC@@@@@__ObjC@@@__ObjC@@@@@Z"
 
 void f(S<__weak __kindof I *>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Weak@PAU?$KindOf@U.objc_cls_I@@@__ObjC@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Weak@PAU?$KindOf@UI@@@__ObjC@@@__ObjC@@@@@Z"
 
 void f(S<__weak __kindof I<P> *>) {}
-// CHECK-LABEL: "?f@@YAXU?$S@U?$Weak@PAU?$KindOf@U?$.objc_cls_I@U?$Protocol@UP@@@__ObjC@@@@@__ObjC@@@__ObjC@@@@@Z"
+// CHECK-LABEL: "?f@@YAXU?$S@U?$Weak@PAU?$KindOf@U?$I@U?$Protocol@UP@@@__ObjC@@@@@__ObjC@@@__ObjC@@@@@Z"
 
 void f(J<I *> *) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_cls_J@PAU.objc_cls_I@@@@@Z"
+// CHECK-LABEL: "?f@@YAXPAU?$J@PAUI@@@@@Z"
 
 void f(J<__kindof I *> *) {}
-// CHECK-LABEL: "?f@@YAXPAU?$.objc_cls_J@PAU?$KindOf@U.objc_cls_I@@@__ObjC@@@@@Z"
-
+// CHECK-LABEL: "?f@@YAXPAU?$J@PAU?$KindOf@UI@@@__ObjC@@@@@Z"
diff --git a/clang/test/CodeGenObjCXX/msabi-objc-types.mm b/clang/test/CodeGenObjCXX/msabi-objc-types.mm
index 08807bbe1a5..192dd4c23ff 100644
--- a/clang/test/CodeGenObjCXX/msabi-objc-types.mm
+++ b/clang/test/CodeGenObjCXX/msabi-objc-types.mm
@@ -3,166 +3,166 @@
 @class I;
 
 id kid;
-// CHECK: @"?kid@@3PAU.objc_object@@A" =  dso_local global
+// CHECK: @"?kid@@3PAUobjc_object@@A" =  dso_local global
 
 Class klass;
-// CHECK: @"?klass@@3PAU.objc_class@@A" = dso_local global
+// CHECK: @"?klass@@3PAUobjc_class@@A" = dso_local global
 
 I *kI;
-// CHECK: @"?kI@@3PAU.objc_cls_I@@A" = dso_local global
+// CHECK: @"?kI@@3PAUI@@A" = dso_local global
 
 void f(I *) {}
-// CHECK-LABEL: "?f@@YAXPAU.objc_cls_I@@@Z"
+// CHECK-LABEL: "?f@@YAXPAUI@@@Z"
 
 void f(const I *) {}
-// CHECK-LABEL: "?f@@YAXPBU.objc_cls_I@@@Z"
+// CHECK-LABEL: "?f@@YAXPBUI@@@Z"
 
 void f(I &) {}
-// CHECK-LABEL: "?f@@YAXAAU.objc_cls_I@@@Z"
+// CHECK-LABEL: "?f@@YAXAAUI@@@Z"
 
 void f(const I &) {}
-// CHECK-LABEL: "?f@@YAXABU.objc_cls_I@@@Z"
+// CHECK-LABEL: "?f@@YAXABUI@@@Z"
 
 void f(const I &&) {}
-// CHECK-LABEL: "?f@@YAX$$QBU.objc_cls_I@@@Z"
+// CHECK-LABEL: "?f@@YAX$$QBUI@@@Z"
 
 void g(id) {}
-// CHECK-LABEL: "?g@@YAXPAU.objc_object@@@Z"
+// CHECK-LABEL: "?g@@YAXPAUobjc_object@@@Z"
 
 void g(id &) {}
-// CHECK-LABEL: "?g@@YAXAAPAU.objc_object@@@Z"
+// CHECK-LABEL: "?g@@YAXAAPAUobjc_object@@@Z"
 
 void g(const id &) {}
-// CHECK-LABEL: "?g@@YAXABQAU.objc_object@@@Z"
+// CHECK-LABEL: "?g@@YAXABQAUobjc_object@@@Z"
 
 void g(id &&) {}
-// CHECK-LABEL: "?g@@YAX$$QAPAU.objc_object@@@Z"
+// CHECK-LABEL: "?g@@YAX$$QAPAUobjc_object@@@Z"
 
 void h(Class) {}
-// CHECK-LABEL: "?h@@YAXPAU.objc_class@@@Z"
+// CHECK-LABEL: "?h@@YAXPAUobjc_class@@@Z"
 
 void h(Class &) {}
-// CHECK-LABEL: "?h@@YAXAAPAU.objc_class@@@Z"
+// CHECK-LABEL: "?h@@YAXAAPAUobjc_class@@@Z"
 
 void h(const Class &) {}
-// CHECK-LABEL: "?h@@YAXABQAU.objc_class@@@Z"
+// CHECK-LABEL: "?h@@YAXABQAUobjc_class@@@Z"
 
 void h(Class &&) {}
-// CHECK-LABEL: "?h@@YAX$$QAPAU.objc_class@@@Z"
+// CHECK-LABEL: "?h@@YAX$$QAPAUobjc_class@@@Z"
 
 I *i() { return nullptr; }
-// CHECK-LABEL: "?i@@YAPAU.objc_cls_I@@XZ"
+// CHECK-LABEL: "?i@@YAPAUI@@XZ"
 
 const I *j() { return nullptr; }
-// CHECK-LABEL: "?j@@YAPBU.objc_cls_I@@XZ"
+// CHECK-LABEL: "?j@@YAPBUI@@XZ"
 
 I &k() { return *kI; }
-// CHECK-LABEL: "?k@@YAAAU.objc_cls_I@@XZ"
+// CHECK-LABEL: "?k@@YAAAUI@@XZ"
 
 const I &l() { return *kI; }
-// CHECK-LABEL: "?l@@YAABU.objc_cls_I@@XZ"
+// CHECK-LABEL: "?l@@YAABUI@@XZ"
 
 void m(const id) {}
-// CHECK-LABEL: "?m@@YAXQAU.objc_object@@@Z"
+// CHECK-LABEL: "?m@@YAXQAUobjc_object@@@Z"
 
 void m(const I *) {}
-// CHECK-LABEL: "?m@@YAXPBU.objc_cls_I@@@Z"
+// CHECK-LABEL: "?m@@YAXPBUI@@@Z"
 
 void n(SEL) {}
-// CHECK-LABEL: "?n@@YAXPAU.objc_selector@@@Z"
+// CHECK-LABEL: "?n@@YAXPAUobjc_selector@@@Z"
 
 void n(SEL *) {}
-// CHECK-LABEL: "?n@@YAXPAPAU.objc_selector@@@Z"
+// CHECK-LABEL: "?n@@YAXPAPAUobjc_selector@@@Z"
 
 void n(const SEL *) {}
-// CHECK-LABEL: "?n@@YAXPBQAU.objc_selector@@@Z"
+// CHECK-LABEL: "?n@@YAXPBQAUobjc_selector@@@Z"
 
 void n(SEL &) {}
-// CHECK-LABEL: "?n@@YAXAAPAU.objc_selector@@@Z"
+// CHECK-LABEL: "?n@@YAXAAPAUobjc_selector@@@Z"
 
 void n(const SEL &) {}
-// CHECK-LABEL: "?n@@YAXABQAU.objc_selector@@@Z"
+// CHECK-LABEL: "?n@@YAXABQAUobjc_selector@@@Z"
 
 void n(SEL &&) {}
-// CHECK-LABEL: "?n@@YAX$$QAPAU.objc_selector@@@Z"
+// CHECK-LABEL: "?n@@YAX$$QAPAUobjc_selector@@@Z"
 
 struct __declspec(dllexport) s {
   struct s &operator=(const struct s &) = delete;
 
   void m(I *) {}
-  // CHECK-LABEL: "?m@s@@QAAXPAU.objc_cls_I@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPAUI@@@Z"
 
   void m(const I *) {}
-  // CHECK-LABEL: "?m@s@@QAAXPBU.objc_cls_I@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPBUI@@@Z"
 
   void m(I &) {}
-  // CHECK-LABEL: "?m@s@@QAAXAAU.objc_cls_I@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXAAUI@@@Z"
 
   void m(const I &) {}
-  // CHECK-LABEL: "?m@s@@QAAXABU.objc_cls_I@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXABUI@@@Z"
 
   void m(I &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QAU.objc_cls_I@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QAUI@@@Z"
 
   void m(const I &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QBU.objc_cls_I@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QBUI@@@Z"
 
   void m(id) {}
-  // CHECK-LABEL: "?m@s@@QAAXPAU.objc_object@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPAUobjc_object@@@Z"
 
   void m(id &) {}
-  // CHECK-LABEL: "?m@s@@QAAXAAPAU.objc_object@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXAAPAUobjc_object@@@Z"
 
   void m(id &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QAPAU.objc_object@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QAPAUobjc_object@@@Z"
 
   void m(const id &) {}
-  // CHECK-LABEL: "?m@s@@QAAXABQAU.objc_object@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXABQAUobjc_object@@@Z"
 
   void m(const id &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QBQAU.objc_object@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QBQAUobjc_object@@@Z"
 
   void m(Class *) {}
-  // CHECK-LABEL: "?m@s@@QAAXPAPAU.objc_class@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPAPAUobjc_class@@@Z"
 
   void m(const Class *) {}
-  // CHECK-LABEL: "?m@s@@QAAXPBQAU.objc_class@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPBQAUobjc_class@@@Z"
 
   void m(Class) {}
-  // CHECK-LABEL: "?m@s@@QAAXPAU.objc_class@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPAUobjc_class@@@Z"
 
   void m(Class &) {}
-  // CHECK-LABEL: "?m@s@@QAAXAAPAU.objc_class@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXAAPAUobjc_class@@@Z"
 
   void m(const Class &) {}
-  // CHECK-LABEL: "?m@s@@QAAXABQAU.objc_class@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXABQAUobjc_class@@@Z"
 
   void m(Class &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QAPAU.objc_class@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QAPAUobjc_class@@@Z"
 
   void m(const Class &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QBQAU.objc_class@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QBQAUobjc_class@@@Z"
 
   void m(SEL) {}
-  // CHECK-LABEL: "?m@s@@QAAXPAU.objc_selector@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPAUobjc_selector@@@Z"
 
   void m(SEL *) {}
-  // CHECK-LABEL: "?m@s@@QAAXPAPAU.objc_selector@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPAPAUobjc_selector@@@Z"
 
   void m(const SEL *) {}
-  // CHECK-LABEL: "?m@s@@QAAXPBQAU.objc_selector@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXPBQAUobjc_selector@@@Z"
 
   void m(SEL &) {}
-  // CHECK-LABEL: "?m@s@@QAAXAAPAU.objc_selector@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXAAPAUobjc_selector@@@Z"
 
   void m(const SEL &) {}
-  // CHECK-LABEL: "?m@s@@QAAXABQAU.objc_selector@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAXABQAUobjc_selector@@@Z"
 
   void m(SEL &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QAPAU.objc_selector@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QAPAUobjc_selector@@@Z"
 
   void m(const SEL &&) {}
-  // CHECK-LABEL: "?m@s@@QAAX$$QBQAU.objc_selector@@@Z"
+  // CHECK-LABEL: "?m@s@@QAAX$$QBQAUobjc_selector@@@Z"
 };
 
 template <typename T>
@@ -179,14 +179,14 @@ struct t {
 };
 
 template struct t<id>;
-// CHECK-LABEL: "??0?$t@PAU.objc_object@@@@QAA@XZ"
+// CHECK-LABEL: "??0?$t@PAUobjc_object@@@@QAA@XZ"
 
 template struct t<remove_pointer<id>::type>;
-// CHECK-LABEL: "??0?$t@U.objc_object@@@@QAA@XZ"
+// CHECK-LABEL: "??0?$t@Uobjc_object@@@@QAA@XZ"
 
 template struct t<SEL>;
-// CHECK-LABEL: "??0?$t@PAU.objc_selector@@@@QAA@XZ"
+// CHECK-LABEL: "??0?$t@PAUobjc_selector@@@@QAA@XZ"
 
 template struct t<remove_pointer<SEL>::type>;
-// CHECK-LABEL: "??0?$t@U.objc_selector@@@@QAA@XZ"
+// CHECK-LABEL: "??0?$t@Uobjc_selector@@@@QAA@XZ"