Optimize APCUBagOStuff::lock and/or replace some callers with FSLockManager
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	aaron
	Aug 16 2022, 11:24 PM

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Description

LoadMonitor is the most common apcu writer for WMF methods. This involves a high number of apcu_add attempts.

Mentioned Here: T315472: Reduce request latency impact from APCUBagOStuff write lock contention
T293630: Investigate performance degradation at high concurrencies in php-fpm

Going with T315472 instead (using apcu_exists).