perf/core improvements and fixes:

New features:

. Allow configuring a 'perf ftrace' default --tracer (Taeung Song)

Infrastructure:

. Sync tools/arch/{powerpc,arm}/include/uapi/asm/kvm.h and
       tools/arch/x86/include/asm/cpufeatures.h (Ingo Molnar)

. Add BPF program file system pinning APIs and respective
  'perf test' entry (Joe Stringer)

. Make tools tree support 'make -s' (Josh Poimboeuf)

. Reference count maps in callchains, fixing SEGFAULT when
  referencing maps after it is freed (Krister Johansen)

. Create for_each_event trace points iterator (Taeung Song)

. Do not consider an error not to have any perfconfig file
  (Arnaldo Carvalho de Melo

. Propagate perf_config() errors (Arnaldo Carvalho de Melo)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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