Make sure #9262 didn't introduce new OOM opportunities
IIUC, the #9262 (moved) changes don't introduce any big new queues or structures, so the OOM handler doesn't need any more changes to think about them. But I just merged #9262 (moved), and now I'm too tired to look for data structure changes. So, this ticket should remind us/me to confirm that we don't need more OOM handler hacking for that, and then put it to bed.
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