The added CHECK aims at finding problems where Peristent is used off
the owning thread.

Bug: chromium:1253650, chromium:1243257
Change-Id: Ia0cbc6005aba38c0d98197ed18c3b40dd2dc33fd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3306972
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78137}