Alright, just XFAIL all these for Windows.

I'm going to fix up FileCheck to better handle things like this soon,
but for now let's just unblock the Windows people.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219513 91177308-0d34-0410-b5e6-96231b3b80d8