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Summary: In https://github.com/facebook/rocksdb/issues/13964 I changed an expensive DEBUG check in ~AutoHyperClockTable to only run in ASAN builds. It's still expensive so I'm modifying it to scan only about one page beyond what we expect to have written to the anonymous mmap, rather than scanning the whole thing. Pull Request resolved: https://github.com/facebook/rocksdb/pull/13998 Test Plan: manually checked that lru_cache_test running time went from 5.0s to 4.0s after the change. Verified that existing unit test ClockCacheTest.Limits uses the full anonymous mmap to be sure it is sized as expected, by temporarily breaking AutoHyperClockTable::Grow() to allow slightly exceeding the anonymous mmap size. Reviewed By: cbi42 Differential Revision: D83178493 Pulled By: pdillinger fbshipit-source-id: a2bf093e98bf68b540c073800be7e193021f2692