* sanitizer_common/sanitizer_stacktrace.cc: Cherry pick upstream
	r209879.
	* sanitizer_common/sanitizer_common.h: Likewise.
	* asan/asan_mapping.h: Likewise.
	* asan/asan_linux.cc: Likewise.
	* tsan/tsan_mman.cc: Cherry pick upstream r209744.
	* sanitizer_common/sanitizer_allocator.h: Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@211080 138bc75d-0d04-0410-961f-82ee72b054a4
runtime: Use _mm_pause rather than __builtin_ia32_pause.

Based on a patch from Peter Collingbourne.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@211081 138bc75d-0d04-0410-961f-82ee72b054a4