math/bits: much faster Reverse, added respective benchmarks

math/bits: much faster Reverse, added respective benchmarks

Measured on 2.3 GHz Intel Core i7, running maxOS 10.12.3.

name         old time/op  new time/op  delta
Reverse-8    76.6ns ± 0%   8.1ns ± 0%   ~     (p=1.000 n=1+1)
Reverse8-8   12.6ns ± 0%   0.6ns ± 0%   ~     (p=1.000 n=1+1)
Reverse16-8  20.8ns ± 0%   0.6ns ± 0%   ~     (p=1.000 n=1+1)
Reverse32-8  36.5ns ± 0%   0.6ns ± 0%   ~     (p=1.000 n=1+1)
Reverse64-8  74.0ns ± 0%   6.4ns ± 0%   ~     (p=1.000 n=1+1)

benchmark                old ns/op     new ns/op     delta
BenchmarkReverse-8       76.6          8.07          -89.46%
BenchmarkReverse8-8      12.6          0.64          -94.92%
BenchmarkReverse16-8     20.8          0.64          -96.92%
BenchmarkReverse32-8     36.5          0.64          -98.25%
BenchmarkReverse64-8     74.0          6.38          -91.38%

Change-Id: I6b99b10cee2f2babfe79342b50ee36a45a34da30
Reviewed-on: https://go-review.googlesource.com/37149
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>