This also introduces CagedHeapLocalData.

Bug: chromium:1029379
Change-Id: Ice04fe5ad7daa02f17ad107e78e53bdd32479737
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2246560Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68358}