It's not "(new super).x" but "new (super.x)".

Bug: v8:11261
Change-Id: Ifc9cae038c1dc8fcdb096e213b4ac79ea20e9238
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2593248
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71763}