Port and integrate the irregexp engine from V8

tests/language/regex/non-capturing-backtracking_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'util.dart';
 import 'package:expect/expect.dart';
-import 'package:async_helper/async_helper.dart';
-
-import "deferred_no_such_method_lib.dart" deferred as lib;
 
 void main() {
-  asyncStart();
-  lib.loadLibrary().then((_) {
-    Expect.equals(42, new lib.C().nonExisting());
-    asyncEnd();
-  });
-}
+  description(
+  "This page tests for proper backtracking with greedy quantifiers and non-capturing parentheses."
+  );
+
+  var re = new RegExp(r"(?:a*)a");
+  shouldBe(re.firstMatch('a'), ['a']);
+}