flate: Faster histograms #620
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Faster histogram for hufman only compression; 1% overall speedup. ``` github-ranks-backup.bin gzkp -2 1862623243 1298789681 5528 321.30 github-ranks-backup.bin gzkp -2 1862623243 1298789681 5471 324.63 ```
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Faster histogram for hufman only compression; 1% overall speedup.