When injecting locations for block-end gap moves into Phis, make sure to
maintain register frame state too, so that the subsequent
MergeRegisterValues call sees the result of these moves.

Bug: v8:7700
Change-Id: I4f68e386c5a6cc578d26904306cb9b0c2f7a90d6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3676861
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80879}