[msan] Set program exit code in keep-going mode.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172057 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] don't fail the test if prctl(PR_SET_NAME) is not supported

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172059 91177308-0d34-0410-b5e6-96231b3b80d8