.. since they may be written from background threads (for SP concurrent
codegen).

Bug: v8:12161
Fixed: chromium:1319857
Change-Id: I11860137ea4d79645821df69e61b62836f7c8283
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3605818
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80185}