Also add a DCHECK to prevent this stupid mistake in the future.

Bug: v8:13190
Fixed: chromium:1363969
Change-Id: Ieb855ccfb42a1a6d84798eb09721d454c355935f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3899313Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83222}