Fix a typo.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192685 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: implement internal syscall-based versions of sigaction/sigprocmask
use them in stoptheworld
fixes applications that intercept sigaction/sigprocmask




git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192686 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Implement allocator_may_return_null=1 in MemorySanitizer.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192687 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: resolve symlinks for called_from_lib suppressions



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192688 91177308-0d34-0410-b5e6-96231b3b80d8
Clean up StopTheWorld code after r192686.

Remove outdated comments. Also remove code that handled an issue in libc's
sigaction(), which we don't use anymore.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192689 91177308-0d34-0410-b5e6-96231b3b80d8