huff0: Improve 4X decompression speed#468
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Improve for tablelog > 8: ``` benchmark old ns/op new ns/op delta BenchmarkDecompress4XNoTable/gettysburg-32 2760 2711 -1.78% BenchmarkDecompress4XNoTable/twain-32 583900 580407 -0.60% BenchmarkDecompress4XNoTable/pngdata.001-32 79094 77148 -2.46% BenchmarkDecompress4XNoTableTableLog8/digits-32 158182 158284 +0.06% BenchmarkDecompress4XTable/digits-32 160960 158540 -1.50% BenchmarkDecompress4XTable/gettysburg-32 3985 3907 -1.96% BenchmarkDecompress4XTable/twain-32 585743 585507 -0.04% BenchmarkDecompress4XTable/low-ent.10k-32 55110 55175 +0.12% BenchmarkDecompress4XTable/superlow-ent-10k-32 15096 14993 -0.68% BenchmarkDecompress4XTable/case1-32 2003 2001 -0.10% BenchmarkDecompress4XTable/case2-32 1970 1964 -0.30% BenchmarkDecompress4XTable/case3-32 1974 1993 +0.96% BenchmarkDecompress4XTable/pngdata.001-32 82138 80294 -2.25% BenchmarkDecompress4XTable/normcount2-32 1346 1334 -0.89% ```
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Improve for tablelog > 8: