We cherish the ability to create a (for example) JSFunctionRef by
passing an object handle in phases of the compiler where we can't
inspect the handle to verify the instance type. A slight change to
constructor definitions of classes derived from ObjectRef allows us to
police this typing effectively.

Bug: v8:7790
Change-Id: I6ac8e4780d578e9c9cad80fdc87f399a92bc988d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1751343
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Auto-Submit: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63199}