[msan] Unpoison param-tls in signal handler wrapper.

This an entry point from uninstrumented code.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@184734 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] Intercept inet_aton.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@184735 91177308-0d34-0410-b5e6-96231b3b80d8