tsan: fix old gcc warnings


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183645 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: fix windows crash (incorrect stack boundaries)


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183646 91177308-0d34-0410-b5e6-96231b3b80d8