00aaea3645
We seem to use this stdatomic.h sometimes, and slightly different prebuilts at other times, making them all difficult to test, and making it unclear which one we're testing. This generalizes the bionic header so that it can be used directly as the prebuilt header as well. So long as they don't diverge again, that should somewhat improve test coverage. Use the correct builtin for atomic_is_lock_free. Fix atomic_flag_init. Turn on atomic tests even with __GLIBC__, since they now appear to pass. Include uchar.h in stdatomic.h where needed. Add a basic memory ordering test. Fix bit-rotted comments in bionic tests makefile. Change-Id: If6a14c1075b379395ba5d93357d56025c0ffab68