Port and integrate the irregexp engine from V8

tests/language/regex/overflow_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';
+
+void main() {
+  description("This test checks expressions with alternative lengths of appox. 2^31.");
+
+  var regexp1 = new RegExp(r"(?:(?=g))|(?:m).{2147483648,}");
+  shouldBeNull(regexp1.firstMatch(''));
+
+  var regexp2 = new RegExp(r"(?:(?=g)).{2147483648,}");
+  shouldBeNull(regexp2.firstMatch(''));
+
+  var s3 = r"&{6}u4a64YfQP{C}u88c4u5772Qu8693{4294967167}u85f2u7f3fs((uf202){4})u5bc6u1947";
+  var regexp3 = new RegExp(s3);
+  shouldBeNull(regexp3.firstMatch(s3));
+
+  var regexp4 = new RegExp(r"[^a$]{4294967295}");
+  shouldBeNull(regexp4.firstMatch(s3));
+}