Now the accessors do not use the LoadWeakFixedArrayElement function.

Bug: v8:8486
Change-Id: Icccf294c25bbedb118cb2dd7a422dc71d70c727b
Reviewed-on: https://chromium-review.googlesource.com/c/1348071Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57748}