The map of an object may be gone by the time we try to compute its
size for accounting purposes.

Bug: chromium:1319217
Change-Id: I93cca766a8cedebf4ed30a3a65fd6eff5bc72bcf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3605817Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80271}