BR 2887108: fix incorrect sbyte usage in IMUL
BR 2887108: fix incorrect sbyte usage in IMUL

Fix a very curious transposition in the instruction patterns for IMUL,
which caused 32-bit IMUL instructions with constants like 0x10001 to
be generated incorrectly.

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

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