Add operator== for comparing two clang::const_strings::StringRef objects.
Add operator== for comparing two clang::const_strings::StringRef objects.

mheinsen/seec,mheinsen/seec,mheinsen/seec,mheinsen/seec,mheinsen/seec,seec-team/seec,seec-team/seec,seec-team/seec,seec-team/seec,seec-team/seec