asan/tsan/msan: use builtin atomic operations when available
this should fix episodic crashes on ARM/PPC
x86_32 is still broken



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@190991 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed