- scan using raw data pointers + GC callback
- scan using scanner tables
- cap internalizing large string values
- inline fast transitioning logic

Change-Id: I545620017b38b80e4193dfaf19381411adf5ff89
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1584320
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61132}