RELNOTES=yes

Change-Id: Ie7090b5a6edd548a49bdc4295e01cb686dfe6522
Reviewed-on: https://go-review.googlesource.com/c/146023
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>