XFAIL coverage -no-integrated-as tests for msvc.

Windows can't use -no-integrated-as, so split these tests out into a
separate file and XFAIL them for win32,win64.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219472 91177308-0d34-0410-b5e6-96231b3b80d8