Also: add hint for "prototype" property. This makes us not miss
the ObjectCreate map in any of our tests.

Bug: v8:7790
Change-Id: Icc9f91ebaf466a1cdfba27526335b930c744b9c5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1762519
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Auto-Submit: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63336}