Parse/Parser.h has some TryParse* functions for tentative parsing that are implemented in Parse/ParseTentative.cpp, but grepping the code turns up no calls to them outside of ParseTentative.cpp. Are these functions unused, or did I miss something?
Most of them at least are used; if you find one that is genuinely unused, that would be very interesting. If you want to find calls to them, try looking at the Annotate* functions.
Also, did you grep the Parser.h header as well? There are some inline implementations in there.
Ah, I hadn't checked the whole call stack.