[release-branch.go1.8] go1.8rc1

Change-Id: I68a99a4d750357dd59eb48f7c05b4dc08c64c92d
Reviewed-on: https://go-review.googlesource.com/35097
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

VERSION

+go1.8rc1
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