Factor out string decoder in insns.pl
Factor out string decoder in insns.pl

Factor out the string decoder into its own subroutine.  This will be
useful shortly ;)

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