And fixes a -Wshadow warning too.

Bug: v8:12244,v8:12245
Change-Id: I940600c21c81fd757794dc934eaf6e918d058bc8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3283621Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77927}