asan/tsan/msan: use builtin atomic operations when available this should fix episodic crashes on ARM/PPC x86_32 is still broken
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: c199f293c43da69278bea8e88f92242bf3aa95f7@190991 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt