Recent Clang versions have enhanced -Wunused-but-set-variable which now
warns about this.

Bug: chromium:1309955
Change-Id: If5c1ce77bdcdb1e04eed4ae9e10ee1d7f2e8658d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3563139Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Auto-Submit: Hans Wennborg <hans@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79693}