... and fix AddSmi operation.

Bug: v8:7700
Change-Id: If81030e1e0d457076e09db62553342f04477e255
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3581983
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79921}