cmd/compile: fix typo in comment
Change-Id: Iec9ed110c4d5a417bd9de0434147665fd3633899
GitHub-Last-Rev:
d2154f9ea12bc1fbb8f7c4feae2060e2534fa5d2
GitHub-Pull-Request: golang/go#66332
Reviewed-on: https://go-review.googlesource.com/c/go/+/571876
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>