This also adds a javascript operator JSCreateObject and an
associated TFS stub that handles Object.create in cases
where only a prototype, but no additional properties are
provided.

Bug: v8:7250
Change-Id: Ib1fd529a10a553c3718222356319bd6ccffbdf30
Reviewed-on: https://chromium-review.googlesource.com/1013576
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52680}