cmd/compile: fix TestFormats

This fixes the linux-amd64-longtest builder, which was broken by CL
147160.

Updates #27539.

Change-Id: If6e69581ef503bba2449ec9bacaa31f34f59beb1
Reviewed-on: https://go-review.googlesource.com/c/149157Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/compile/fmt_test.go

@@ -672,6 +672,7 @@ var knownFormats = map[string]string{
 	"cmd/compile/internal/types.EType %d":             "",
 	"cmd/compile/internal/types.EType %s":             "",
 	"cmd/compile/internal/types.EType %v":             "",
+	"cmd/internal/obj.ABI %v":                         "",
 	"error %v":                                        "",
 	"float64 %.2f":                                    "",
 	"float64 %.3f":                                    "",

src/cmd/compile/internal/gc/gsubr.go

@@ -216,7 +216,7 @@ func (f *Func) initLSym(hasBody bool) {
 			// using the expected ABI.
 			want := obj.ABIInternal
 			if f.lsym.ABI() != want {
-				Fatalf("function symbol %s has the wrong ABI %v, expected %v", f.lsym, f.lsym.ABI(), want)
+				Fatalf("function symbol %s has the wrong ABI %v, expected %v", f.lsym.Name, f.lsym.ABI(), want)
 			}
 		}