Preston Van Loon 79434fc2d1
Use sync.pool for keccak256 and sha256 (#4710)
* Use sync.pool for keccak

* Add sha256 too

* custom hasher use pool too

* reset custom hasher

* fix?

* Add comment that customHasher should only be used in cases of more than 5 usages
2020-02-01 16:37:37 -08:00
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