[release-branch.go1.7] go1.7rc1

Change-Id: Ifbf1c13ce740428add68d68133c7f10876bad404
Reviewed-on: https://go-review.googlesource.com/24816
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>

VERSION

+go1.7rc1
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