flate: Improve decompression speed 5-10%#483
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``` benchmark old ns/op new ns/op delta BenchmarkDecodeDigitsSpeed1e4-32 49461 44204 -10.63% BenchmarkDecodeDigitsSpeed1e5-32 520488 509001 -2.21% BenchmarkDecodeDigitsSpeed1e6-32 5152811 5000738 -2.95% BenchmarkDecodeDigitsDefault1e4-32 50983 47693 -6.45% BenchmarkDecodeDigitsDefault1e5-32 494800 488243 -1.33% BenchmarkDecodeDigitsDefault1e6-32 4990322 4752297 -4.77% BenchmarkDecodeDigitsCompress1e4-32 49973 43992 -11.97% BenchmarkDecodeDigitsCompress1e5-32 515033 467616 -9.21% BenchmarkDecodeDigitsCompress1e6-32 5128402 4659296 -9.15% BenchmarkDecodeTwainSpeed1e4-32 51740 48324 -6.60% BenchmarkDecodeTwainSpeed1e5-32 532690 513209 -3.66% BenchmarkDecodeTwainSpeed1e6-32 5304535 5129081 -3.31% BenchmarkDecodeTwainDefault1e4-32 50613 48007 -5.15% BenchmarkDecodeTwainDefault1e5-32 488404 476945 -2.35% BenchmarkDecodeTwainDefault1e6-32 4881062 4710812 -3.49% BenchmarkDecodeTwainCompress1e4-32 49583 45632 -7.97% BenchmarkDecodeTwainCompress1e5-32 458843 445645 -2.88% BenchmarkDecodeTwainCompress1e6-32 4544787 4392530 -3.35% BenchmarkDecodeRandomSpeed1e4-32 298 305 +2.21% BenchmarkDecodeRandomSpeed1e5-32 1909 1909 +0.00% BenchmarkDecodeRandomSpeed1e6-32 19987 19809 -0.89% benchmark old MB/s new MB/s speedup BenchmarkDecodeDigitsSpeed1e4-32 202.18 226.23 1.12x BenchmarkDecodeDigitsSpeed1e5-32 192.13 196.46 1.02x BenchmarkDecodeDigitsSpeed1e6-32 194.07 199.97 1.03x BenchmarkDecodeDigitsDefault1e4-32 196.15 209.68 1.07x BenchmarkDecodeDigitsDefault1e5-32 202.10 204.82 1.01x BenchmarkDecodeDigitsDefault1e6-32 200.39 210.42 1.05x BenchmarkDecodeDigitsCompress1e4-32 200.11 227.31 1.14x BenchmarkDecodeDigitsCompress1e5-32 194.16 213.85 1.10x BenchmarkDecodeDigitsCompress1e6-32 194.99 214.62 1.10x BenchmarkDecodeTwainSpeed1e4-32 193.27 206.94 1.07x BenchmarkDecodeTwainSpeed1e5-32 187.73 194.85 1.04x BenchmarkDecodeTwainSpeed1e6-32 188.52 194.97 1.03x BenchmarkDecodeTwainDefault1e4-32 197.58 208.30 1.05x BenchmarkDecodeTwainDefault1e5-32 204.75 209.67 1.02x BenchmarkDecodeTwainDefault1e6-32 204.87 212.28 1.04x BenchmarkDecodeTwainCompress1e4-32 201.68 219.14 1.09x BenchmarkDecodeTwainCompress1e5-32 217.94 224.39 1.03x BenchmarkDecodeTwainCompress1e6-32 220.03 227.66 1.03x BenchmarkDecodeRandomSpeed1e4-32 33551.69 32828.68 0.98x BenchmarkDecodeRandomSpeed1e5-32 52391.84 52395.57 1.00x BenchmarkDecodeRandomSpeed1e6-32 50031.69 50482.80 1.01x ```
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("Random" is just memcopies, so unaffected by this)