cmd/objdump: skip TestDisasm* for mips64{,le}

Disassembler for mips64 is not supported yet.

Change-Id: Ie923dd1e37fed47fc395b9d1cd9194e55020bee5
Reviewed-on: https://go-review.googlesource.com/14459Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/objdump/objdump_test.go

@@ -105,6 +105,8 @@ func TestDisasm(t *testing.T) {
 		t.Skipf("skipping on %s, issue 9039", runtime.GOARCH)
 	case "arm64":
 		t.Skipf("skipping on %s, issue 10106", runtime.GOARCH)
+	case "mips64", "mips64le":
+		t.Skipf("skipping on %s, issue 12559", runtime.GOARCH)
 	}
 	testDisasm(t)
 }
@@ -119,6 +121,8 @@ func TestDisasmExtld(t *testing.T) {
 		t.Skipf("skipping on %s, no support for external linking, issue 9038", runtime.GOARCH)
 	case "arm64":
 		t.Skipf("skipping on %s, issue 10106", runtime.GOARCH)
+	case "mips64", "mips64le":
+		t.Skipf("skipping on %s, issue 12559 and 12560", runtime.GOARCH)
 	}
 	// TODO(jsing): Reenable once openbsd/arm has external linking support.
 	if runtime.GOOS == "openbsd" && runtime.GOARCH == "arm" {