This CL introduces a CHECK to narrow down the cause for a crash
happening in the wild, but that currently has no reproduction case.

Bug: chromium:1035651
Change-Id: I61c0658d4b753f2c7d12aa8e20d5a2ff69594d1d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1985989Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65592}