Add a RemoveFileOnSignal that takes a StringRef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183943 91177308-0d34-0410-b5e6-96231b3b80d8
Don't use PathV1.h in Signals.h.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183947 91177308-0d34-0410-b5e6-96231b3b80d8
Try to fix the windows build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183950 91177308-0d34-0410-b5e6-96231b3b80d8