This requires a change to instruction selector to UseUnique so that it
does not shadow the temporary register.

Bug: v8:9810
Change-Id: I3da3e18fbbcc1dd8d40821a6c2453fd2d975ad15
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1849981Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64203}