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1745926fc6
Rework our hash functions a bit for significant better performance: * Rename int_hash to u32_hash to mirror u64_hash. * Make pair_int_hash call u64_hash instead of multiple u32_hash()es. * Implement MurmurHash3's fmix32 and fmix64 for u32_hash and u64_hash. On my machine, this speeds up u32_hash by 20%, u64_hash by ~290%, and pair_int_hash by ~260%. We lose the property that an input of 0 results in something that is not 0. I've experimented with an offset to both hash functions, but it resulted in a measurable performance degradation for u64_hash. If there's a good use case for 0 not to result in 0, we can always add in that offset as a countermeasure in the future.