Make sure to always start at the innermost loop, and to have Jump phis
participate in the lifetime extension.

Bug: v8:7700
Change-Id: Iefb9108519d027782ba9f0ce8c0696fba0a0aa52
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3793390Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82102}