Add a test-case for lit xunit output

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223307 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 0baca9564c9df7b06645f71abdda0fe3090f46a6)
1 file changed