It should be quick regardless of how large H is.
Fixesgolang/go#10746
Change-Id: Icde36047e88d9786e64f44724b7ba8b38db2a33f
Reviewed-on: https://go-review.googlesource.com/9836
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Manual edits to README.
Moved from main Go repository, deleted Makefiles.
Tested with go test code.google.com/p/go.image/...
Fixesgolang/go#2797.
R=rsc, rsc, r
CC=golang-dev
https://golang.org/cl/5593053