[SharedCache] Remove unnecessary lock in SharedCache destructor
#6194
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From what I can tell the lock being taken in `SharedCache::~SharedCache` was purely for the decrement of `sharedCacheReferences`, however its an atomic so a lock isn't necessary. The lock being taken is extremely contentious and therefore often slow to be acquired. This resulted in a surprising amount of execution time spent in the `SharedCache` destructor. Nothing hugely significant but a quick and easy win to remove this single line of code.
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From what I can tell the lock being taken in
SharedCache::~SharedCachewas purely for the decrement ofsharedCacheReferences, however its an atomic so a lock isn't necessary. The lock being taken is extremely contentious and therefore often slow to be acquired. This resulted in a surprising amount of execution time spent in theSharedCachedestructor. Nothing hugely significant but a quick and easy win to remove this single line of code.