Right trimming of arrays was deleting old-to-new slots during a GC pause.
Disable slots removal for right trimming of arrays and ensure no more slots
are deleted during a GC pause.

Bug: v8:9454
Change-Id: I6268d63b82713d765247dca4aaadadfe275b7dcd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1691915Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62604}