tsan: fix a bug


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172710 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: fix a bug


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172712 91177308-0d34-0410-b5e6-96231b3b80d8