cmd/compile: delete unused code and fix typo in comment
Change-Id: Ia1f1c7d5563a74950c47cf3ebdcb600b34c83e85
GitHub-Last-Rev:
bd58214e5e66e32c0055936820b8f0adf7f388c6
GitHub-Pull-Request: golang/go#65527
Reviewed-on: https://go-review.googlesource.com/c/go/+/561355
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>