search for: validatetargetoperandclass

This is per Vladimir Medic: Hi all, I have looked at the commits 174488 and174487 by Jim Grosbach as this is something that could be very useful for the mips llvm assembler that I'm working on. In fact, I came up with a similar idea myself a few months ago but I rejected it in the end for one reason only: The MatchKindClass enumerated value is defined inside the GET_MATCHER_IMPLEMENTATION