[release-branch.go1.5] go1.5.2

Change-Id: I65289f4019a975126d4cda3fd26379829912c0cd
Reviewed-on: https://go-review.googlesource.com/17336
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

VERSION

-go1.5.1
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+go1.5.2
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