Contexts are not included into bytecode loop assignment
analysis. We follow TF and create a LoopPhi unconditionally.

Bug: v8:7700
Fixed: chromium:1359662
Change-Id: I1a589a4bae2bbbf14bf637f0c1e0439e66216aae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3871209
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82984}