- Reset parent object and signal stack with nullptr sentinel
- Adjust FATAL messaging
- Fix dispatch for in-construction objects on stack

Bug: v8:11709
Change-Id: I4da0f0f373699aa1fa09745231911c7056978a4f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2856837Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74275}