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bzip2: improve performance
Improve performance of move-to-front by using cache-friendly copies instead of doubly-linked list. Simplify so that the underlying slice is the object. Remove the n=0 special case, which was actually slower with the copy approach. benchmark old ns/op new ns/op delta BenchmarkDecodeDigits 26429714 23859699 -9.72% BenchmarkDecodeTwain 76684510 67591946 -11.86% benchmark old MB/s new MB/s speedup BenchmarkDecodeDigits 1.63 1.81 1.11x BenchmarkDecodeTwain 1.63 1.85 1.13x Updates #6754. LGTM=adg, agl, josharian R=adg, agl, josharian CC=golang-codereviews https://golang.org/cl/131840043
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