PretenureAllocationSite didn't check whether the given object is in new
space or not. Once given an object in old space, PretenureAllocationSite
tried to find a memento for it which didn't exist and crashed.

This CL adds a bailout for objects not in new space as there is no
memento and nothing to be done.

Bug: chromium:1244333
Change-Id: Ic26a6f5994ef9942decda69bb8a23fb730bf945c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3140604Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76656}