[msan] A runtime option to disable wrapping of signal handlers.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178865 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Conditionally disable new() and delete() wrappers.

To be used with static libstdc++.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178866 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Fix sigaction interceptor.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178868 91177308-0d34-0410-b5e6-96231b3b80d8