Operand 1 is not always a register (when AVX is supported).

Bug: chromium:1182571,v8:11215
Change-Id: I75740b4900c4d8b4a10478780d93c995836faeb2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2724393Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73144}