Fix typo

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209540 91177308-0d34-0410-b5e6-96231b3b80d8
Fix broken FileCheck prefix

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209541 91177308-0d34-0410-b5e6-96231b3b80d8