Add a fast path for keyed loads that are:

  1. Monomorphic,
  2. Fast elements accesses,
  3. Not out-of-bounds (deopt on OOB),
  4. Not holey

Bug: v8:7700
Change-Id: I4d46f4d0ce7065c93a9b092833fb16a8c9e9f94e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3882974
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83149}