In this part: indexOf, lastIndexOf

Bug: v8:11111
Change-Id: I51481ccf44ad6c3ebc9216c1b6cc870fda73566e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3726209
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81439}