Add empty kernel-ssa test

tests/compiler/dart2js/kernel/empty_test.dart

Index: tests/compiler/dart2js/kernel/empty_test.dart
diff --git a/tests/compiler/dart2js/kernel/empty_test.dart b/tests/compiler/dart2js/kernel/empty_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f3fe00b818a958161620f591c6d7bb21ff4b0de3
--- /dev/null
+++ b/tests/compiler/dart2js/kernel/empty_test.dart
@@ -0,0 +1,9 @@
+import 'package:test/test.dart';
+
+import 'helper.dart' show check;
+
+main() {
+  test('compile empty function', () {
+    return check("main() {}");
+  });
+}