fix a typo

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195760 91177308-0d34-0410-b5e6-96231b3b80d8
Changed non-printable characters in the test to the escaped form. Apparently, not all tools display non-printable characters ;)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195761 91177308-0d34-0410-b5e6-96231b3b80d8