[release-branch.go1.8] go1.8.5

Change-Id: I7c6cf169e84329a31d2d9dc4c52d5c29e80482c9
Reviewed-on: https://go-review.googlesource.com/71350
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

VERSION

@@ -1 +1 @@
-go1.8.4
+go1.8.5