insns.dat: Mark the immediate for shift instructions as imm8
insns.dat: Mark the immediate for shift instructions as imm8

Allow the form:

      mov <rm>,byte 1

... to generate the explicit byte form.  An unfortunate side effect is
that disassembly is ugly; this could be fixed by making a special byte
code that acts the same for the assembler but disassembles specially.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

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