It should be quick regardless of how large H is. Fixes golang/go#10746 Change-Id: Icde36047e88d9786e64f44724b7ba8b38db2a33f Reviewed-on: https://go-review.googlesource.com/9836 Reviewed-by: Nigel Tao <nigeltao@golang.org>
R=nigeltao CC=golang-dev https://golang.org/cl/13407045