Fixes spurious DCHECK triggering due to bug introduced in
https://chromium-review.googlesource.com/c/v8/v8/+/1836258.

Bug: chromium:1011596
Change-Id: Ia3b1eb25d326e465b3239f191aad11d90a2e56a8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1844777Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64125}