deflate: Use compound hcode #622
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~5% Faster for huffman-only, same for rest. ``` github-ranks-backup.bin gzkp -2 1862623243 1298789681 5547 320.22 github-ranks-backup.bin gzkp -2 1862623243 1298789681 5305 334.83 ``` Replaces #619 - more speedup, and no regression.
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~5% Faster for huffman-only, same for rest.
Before/after:
Replaces #619 - more speedup, and no regression.