Since the number of properties is always 0, we can just directly use the
Object function's initial map.

Bug: v8:7790
Change-Id: I061bd522f5bce1c059cd82f5946d8bc572dbfb27
Reviewed-on: https://chromium-review.googlesource.com/1180887Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55208}