Mechanical move simplifying a follow up that removes the recursive
locking strategy by properly partitioning pages.

Bug: v8:6923
Change-Id: I688e61131731e2b9dc9c311b0b43f0902c149359
Reviewed-on: https://chromium-review.googlesource.com/723020Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48640}