This means we don't need to copy over properties, and accessors stay in
place similar to when we deserialize a custom snapshot.

This slightly changes the semantics of Context::New, so let's see
whether someone depends on this behaviour. We may need to revert if so
(hopefully until we can update the embedder).


Bug: v8:12113
Change-Id: I8325480a00bab5b2bb6ea42274e295b0d4dfc85c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3162143
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76928}