Track releasable hugepages in HugeRegion with a bitmap. - #1017
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`HugeRegion::Release` scanned all 512 `backed_`/`pages_used_` entries to find free-and-backed hugepages. Maintain a 512-bit `unreleasable_` bitmap at the transitions that already update `free_backed_count_`, and walk its free ranges with `NextFreeRange`/`PrevFreeRange` (new) instead, marking whole ranges at once. PiperOrigin-RevId: 984062570
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Track releasable hugepages in HugeRegion with a bitmap.
HugeRegion::Releasescanned all 512backed_/pages_used_entries to findfree-and-backed hugepages. Maintain a 512-bit
unreleasable_bitmap at thetransitions that already update
free_backed_count_, and walk its free rangeswith
NextFreeRange/PrevFreeRange(new) instead, marking whole ranges atonce.