Also fix a bogus test.

R=bmeurer@chromium.org

Bug: v8:5940
Change-Id: I6e201ce35f9021e12d1e4b6127d4accc1425cdb9
Reviewed-on: https://chromium-review.googlesource.com/870596
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50674}