runtime: skip fork test on darwin/arm64

Just like darwin/arm.

Change-Id: Ie4998d24b2d891a9f6c8047ec40cd3fdf80622cd
Reviewed-on: https://go-review.googlesource.com/8812Reviewed-by: Minux Ma <minux@golang.org>

src/runtime/crash_cgo_test.go

@@ -57,7 +57,7 @@ func TestCgoExternalThreadSIGPROF(t *testing.T) {
 	case "plan9", "windows":
 		t.Skipf("no pthreads on %s", runtime.GOOS)
 	case "darwin":
-		if runtime.GOARCH != "arm" {
+		if runtime.GOARCH != "arm" && runtime.GOARCH != "arm64" {
 			// static constructor needs external linking, but we don't support
 			// external linking on OS X 10.6.
 			out, err := exec.Command("uname", "-r").Output()

src/runtime/crash_test.go

@@ -42,8 +42,9 @@ func executeTest(t *testing.T, templ string, data interface{}, extra ...string)
 	case "android", "nacl":
 		t.Skipf("skipping on %s", runtime.GOOS)
 	case "darwin":
-		if runtime.GOARCH == "arm" {
-			t.Skipf("skipping on %s/%s", runtime.GOOS, runtime.GOARCH)
+		switch runtime.GOARCH {
+		case "arm", "arm64":
+			t.Skipf("skipping on %s/%s, no fork", runtime.GOOS, runtime.GOARCH)
 		}
 	}
 

src/runtime/runtime_test.go

@@ -99,8 +99,9 @@ func TestRuntimeGogoBytes(t *testing.T) {
 	case "android", "nacl":
 		t.Skipf("skipping on %s", GOOS)
 	case "darwin":
-		if GOARCH == "arm" {
-			t.Skipf("skipping on %s/%s", GOOS, GOARCH)
+		switch GOARCH {
+		case "arm", "arm64":
+			t.Skipf("skipping on %s/%s, no fork", GOOS, GOARCH)
 		}
 	}