On-heap objects may have TracedReferences, which are uncompressed
pointers that still need to be conservatively scanned (another CL).

Bug: chromium:1325007
Change-Id: If05add36191978486f315dc1ef142a7ed8d4a7bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804808
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82152}