JS objects with embedder fields cannot be deferred because the
serialize/deserialize callbacks need the back reference immediately
to identify the object.

Refs: https://github.com/nodejs/node-v8/issues/175
Bug: v8:11146
Change-Id: I4292f2ab0041f7b0779620437ed26905c194cd9b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2531195Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/master@{#71134}