[msan] Really disable replacement new and delete.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@179522 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Fix sigaction test.

Restore SIGPROF handler to the original state after the test.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@179524 91177308-0d34-0410-b5e6-96231b3b80d8