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v2021.07.20.01
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@Orvid Orvid released this 22 Jul 22:42
v2021.07.20.01
937fc98 
Use CoreCachedSharedPtr in Singleton

Summary: `CoreCachedSharedPtr` is almost as fast as `ReadMostlySharedPtr`, so we can use it to have a better default that does not have pathological behavior under heavy contention. `try_get_fast()` is still useful if we need to squeeze out the last cycle.

Reviewed By: philippv, luciang

Differential Revision: D29812053

fbshipit-source-id: 49e9e53444f8099dbfe13e36c3c07c1b57bb89fb
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