We don't need DefineSameAsFirst for AVX, this can save some moves.

Bug: v8:9561
Change-Id: Ie30334d4a8f82d171d8048c2e02792c60b0106a7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2727151Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73176}