River Riddle 67f52f35d6 [mlir][StorageUniquer] Refactor parametric storage to use sharded dense sets ...

This revisions implements sharding in the storage of parametric instances to decrease lock contention by sharding out the allocator/mutex/etc. to use for a specific storage instance based on the hash key. This is a somewhat common approach to reducing lock contention on data structures, and is used by the concurrent hashmaps provided by folly/java/etc. For several compilations tested, this removed all/most lock contention from profiles and reduced compile time by several seconds.

Differential Revision: https://reviews.llvm.org/D89659

2020-10-26 19:40:19 -07:00

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