cmd/compile: use raw strings to avoid double escapes
Change-Id: I39917b90b67f630f8212853c0a201635960275cb
GitHub-Last-Rev:
fe886534b493fc6241b4451256c889b2fdee997f
GitHub-Pull-Request: golang/go#66180
Reviewed-on: https://go-review.googlesource.com/c/go/+/569975
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>