In this part: at

Drive-by: test helper cleanup

Bug: v8:11111
Change-Id: I760d0c4ee078c397c8a8365ec96101b488986d41
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3764344Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81774}