Updates golang/go#21719

Change-Id: I3709577f48bcbff26beb6f5b8ff8d06fb18cc619
Reviewed-on: https://go-review.googlesource.com/c/tools/+/183877


Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>