It's possible the path into resumable loop looks dead, while the loop
body itself is resumable and is being optimized due to an active
generator running the loop. By reviving resumable loop headers we have a
chance to properly optimize such generators (and avoid deoptimizing them
prematurely).

Bug: v8:7700
Change-Id: Icf5dadba17a7fd38409193e1e3f702f108a5639e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3918093
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83432}