This CL fixes a spec violation that new spec tests uncovered.

R=thibaudm@chromium.org
CC=ecmziegler@chromium.org

Change-Id: Ie8ae455117f1c719815bad78f14c3b2c5e404e79
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2122023
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66885}