c++coroutines - Address review comments, make a more specific pass gate.

To avoid scanning every function for coroutine state machine IFNs, we
allocate and set a bit in the function structure for coroutines.  This
together with the enable flag, can be tested to skip the scan for all
other functions.

2019-12-03  Iain Sandoe  <iain@sandoe.co.uk>

	gcc/
	* coroutine-passes.cc (gate): Check for coroutine components in
	addition to the coroutine enable flag before executing the IFN
	lowering pass.
	* function.h (struct function): Allocate a bit to indicate that
	the function is a coroutine component.

	gcc/cp/
	* decl.c (emit_coro_helper): Set coroutine component bit when
	needed.
	(finish_function): Likewise.



git-svn-id: https://gcc.gnu.org/svn/gcc/branches/c++-coroutines@278936 138bc75d-0d04-0410-961f-82ee72b054a4

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