trunk/52ba1c3557bddebc9cdacb3a09e2337bf518ec7d: Report every mapped segment in a per-pool memory snapshot (#199845)

发生了什么

Summary (human written only) Human note: fix memory_snapshot not reporting valid segments if they come after an unmapped hole. This doesn't happen in normal growth scenarios (there are no unmapped holes) but release_blocks called during empty_cache can lead to this situation Agent details (if applicable) memory_snapshot(mempool_id=...) dropped part of any expandable segment with an unmapped hole. The snapshot report…

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