Change-Id: I678336daf99f7d7d19f99506f1a604de8e05bf43
Reviewed-on: https://go-review.googlesource.com/5400
Reviewed-by: Russ Cox <rsc@golang.org>
strconv: optimize decimal to string conversion (https://golang.org/cl/2105)
math/big: faster assembly kernels for amd64 and 386 (https://golang.org/cl/2503, https://golang.org/cl/2560)
math/big: faster "pure Go" kernels for platforms w/o assembly kernels (https://golang.org/cl/2480)
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