runtime: Correct flag (FlagNoGC => FlagNoInvokeGC).


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@204617 138bc75d-0d04-0410-961f-82ee72b054a4
	* c-common.c (atomic_size_supported_p): New function.
	(resolve_overloaded_atomic_exchange)
	(resolve_overloaded_atomic_compare_exchange)
	(resolve_overloaded_atomic_load, resolve_overloaded_atomic_store):
	Use it instead of comparing size with a local list of sizes.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@204618 138bc75d-0d04-0410-961f-82ee72b054a4