cmd/compile: const name and label name may match
Robert Griesemer authored
Fixes #13684.

Change-Id: I3977119b6eb1d6b7dc2ea1e7d6656a8f0d421bc1
Reviewed-on: https://go-review.googlesource.com/18060


Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: default avatarRob Pike <r@golang.org>
d6a203ec