[globalisel][tablegen] Rename and re-comment to match the new MatchTables. NFC.

The conversion to MatchTable left the function names and comments referring to
C++ statements and expressions. Updated the names and comments to account for
the fact that they're no longer unconstrained statements/expressions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307246 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed