cmd/compile: fix fmt_test.go after CL 170062
cmd/compile: fix fmt_test.go after CL 170062

Updates #22326.

Change-Id: Ia9173b6eb29b2a4f90f4ba39bf53b6e9b7a6d6bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/179398
Run-TryBot: Matthew Dempsky <e56ac2c500064424afac424d4b5e53bd0570a731@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

CAFxX/go,golang/go,golang/go,golang/go,akutz/go,akutz/go,golang/go,CAFxX/go,cloudflare/go,nawawi/go,cloudflare/go,cloudflare/go,nawawi/go,golang/go,cloudflare/go,nawawi/go,akutz/go,CAFxX/go,nawawi/go,CAFxX/go,golang/go,akutz/go,cloudflare/go,nawawi/go,nawawi/go,akutz/go,cloudflare/go,nawawi/go,CAFxX/go,akutz/go,cloudflare/go,cloudflare/go,akutz/go,CAFxX/go,CAFxX/go,golang/go,golang/go,nawawi/go,akutz/go,CAFxX/go