deflate: Speed up huffman encoding #455
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320.36 -> 365.47MB/s (github-june-2days-2019.json) 237.41-> 266.14 MB/s (github-ranks-backup.bin)
klauspost
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klauspost
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Huffman only:
320.36 -> 414.67MB/s (github-june-2days-2019.json)
237.41-> 293.24 MB/s (github-ranks-backup.bin)
Level 1:
278.94 -> 308.47 MB/s (github-june-2days-2019.json)
232.93 -> 261.16MB/s (github-ranks-backup.bin)