The function can be invoked in a background task and has to take the
page mutex to sweep it.

Bug: chromium:1040700
Change-Id: I552fd636ca62f45496dc6c663a0a12d428eb2e20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2007273Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65847}