This CL prepares ground for adding CSA implementation of TransitionArray lookup.

Bug: v8:7310
Change-Id: Ie82e4db8f8a0cdb1dd7bbb759fd60ad55855fe72
Reviewed-on: https://chromium-review.googlesource.com/983920
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52298}