Benchmark on Intel(R) Xeon(R) CPU X5650  @ 2.67GHz

benchmark              old ns/op    new ns/op    delta
BenchmarkHash8Bytes         1779         1114  -37.38%
BenchmarkHash1K             9848         4894  -50.30%
BenchmarkHash8K            68513        32187  -53.02%

benchmark               old MB/s     new MB/s  speedup
BenchmarkHash8Bytes         4.50         7.18    1.60x
BenchmarkHash1K           103.97       209.19    2.01x
BenchmarkHash8K           119.57       254.51    2.13x

R=agl
CC=golang-codereviews
https://golang.org/cl/37150044