Add equivalence testing on JS nodes to support different label names

tests/compiler/dart2js/kernel/compile_from_dill_test.dart

Index: tests/compiler/dart2js/kernel/compile_from_dill_test.dart
diff --git a/tests/compiler/dart2js/kernel/compile_from_dill_test.dart b/tests/compiler/dart2js/kernel/compile_from_dill_test.dart
index 575b8a758fb3ac6678829d1d9f144698f3b422c4..ac7886c4286815261109ec99476426f2fe5acabf 100644
--- a/tests/compiler/dart2js/kernel/compile_from_dill_test.dart
+++ b/tests/compiler/dart2js/kernel/compile_from_dill_test.dart
@@ -6,33 +6,12 @@
 // compilation using the default emitter (full_emitter).
 library dart2js.kernel.compile_from_dill_test;
 
-import 'dart:async';
 import 'package:async_helper/async_helper.dart';
-import '../serialization/helper.dart';
 
 import 'compile_from_dill_test_helper.dart';
 
 main(List<String> args) {
   asyncTest(() async {
-    await mainInternal(args);
+    await runTests(args);
   });
 }
-
-Future<ResultKind> mainInternal(List<String> args,
-    {bool skipWarnings: false, bool skipErrors: false}) async {
-  Arguments arguments = new Arguments.from(args);
-  Uri entryPoint;
-  Map<String, String> memorySourceFiles;
-  if (arguments.uri != null) {
-    entryPoint = arguments.uri;
-    memorySourceFiles = const <String, String>{};
-  } else {
-    entryPoint = Uri.parse('memory:main.dart');
-    memorySourceFiles = SOURCE;
-  }
-
-  return runTest(entryPoint, memorySourceFiles,
-      verbose: arguments.verbose,
-      skipWarnings: skipWarnings,
-      skipErrors: skipErrors);
-}