My last CL introduced a null-pointer bug there.

Bug: chromium:1126771, v8:7790
Change-Id: Ib16317dea14c9fbad7951cb28ce7bb8bb9ce41c3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2402037
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69799}