cmd/compile/internal/gc: use GoToolPath in TestDeps

Updates #31563
Fixes #34041

Change-Id: Ib9fdcd2f83d867fd31b42eab3a813f5cef88860e
Reviewed-on: https://go-review.googlesource.com/c/go/+/193077
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

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

@@ -12,8 +12,7 @@ import (
 )
 
 func TestDeps(t *testing.T) {
-	testenv.MustHaveGoBuild(t)
-	out, err := exec.Command("go", "list", "-f", "{{.Deps}}", "cmd/compile/internal/gc").Output()
+	out, err := exec.Command(testenv.GoToolPath(t), "list", "-f", "{{.Deps}}", "cmd/compile/internal/gc").Output()
 	if err != nil {
 		t.Fatal(err)
 	}