Trivial optimization.
Cached string indexing in inner loop of Btoui64. Before: strconv_test.BenchmarkAtoi 5000000 309 ns/op strconv_test.BenchmarkAtoiNeg 5000000 325 ns/op strconv_test.BenchmarkAtoi64 5000000 465 ns/op strconv_test.BenchmarkAtoi64Neg 5000000 469 ns/op After: strconv_test.BenchmarkAtoi 10000000 182 ns/op strconv_test.BenchmarkAtoiNeg 10000000 193 ns/op strconv_test.BenchmarkAtoi64 10000000 251 ns/op strconv_test.BenchmarkAtoi64Neg 10000000 258 ns/op R=golang-dev, gri CC=golang-dev https://golang.org/cl/1227042
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