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b2dac997 - Use Hashbrown's raw entry API to reduce hashes and clone in priority (#10881)

Use Hashbrown's raw entry API to reduce hashes and clone in priority (#10881) ## Summary I'm open to not merging this -- I was kind of just interested in what the API looked like. But the idea is: we can avoid hashing values twice and unnecessarily cloning within the priority map by using the raw entry API.