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a4b09af3e9
LWLockAttemptLock pointlessly read the lock's state in every loop iteration, even though pg_atomic_compare_exchange_u32() returns the old value. Instead do that only once before the loop iteration. Additionally there's no need to have the expected_state variable, old_state mostly had the same value anyway. Noticed-By: Heikki Linnakangas Backpatch: 9.5, no reason to let the branches diverge at this point