... for the vector forms of {SQ,UQ,}{INC,DEC}P instructions. Also continue
supporting the existing behaviour of not requiring an explicit size
specifier. The preferred disassembly is *with* the specifier.
This is implemented by redefining instruction forms to require vector predicates
with explicit size and adding aliases, which allow a predicate with no size.
nit: for consistency with the rest of the file, can you group the InstAliases and move them below the definitions of the instructions?