Add test file missed from r223561.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223595 91177308-0d34-0410-b5e6-96231b3b80d8
Add some file content to avoid test failures on content-addressed file systems.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223596 91177308-0d34-0410-b5e6-96231b3b80d8