(Hopefully) fix the handing of MMX instructions with prefixes
(Hopefully) fix the handing of MMX instructions with prefixes

Mark MMX instructions with \323 (do not add REX.W) unless they involve
the integer instruction file.

Change SM -> SQ for MMX instructions.

Something not complete attached, so my understanding is
mmxreg,mmxrm needs SQ

Something like xmmreg,reg32 needs SD
xmmreg,xmmrm needs SO

Distrotech/nasm,techkey/nasm,projedi/nasm,Distrotech/nasm,projedi/nasm,Distrotech/nasm,techkey/nasm,projedi/nasm,letolabs/nasm,techkey/nasm,techkey/nasm,techkey/nasm,projedi/nasm,letolabs/nasm,Distrotech/nasm,turingstudio/nasm,projedi/nasm,turingstudio/nasm,turingstudio/nasm,turingstudio/nasm,letolabs/nasm