Turn this assertion also on for release builds for now. This shouldn't
regress sweeping performance because we do the same work as in the last
release.

Bug: v8:12760
Change-Id: I02f78157d20780f46bb4aebf59ce96a7b52f0a27
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3571810Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79841}