Port and integrate the irregexp engine from V8

tests/language/regex/range-bound-ffff_test.dart

Index: tests/language/regex/range-bound-ffff_test.dart
diff --git a/tests/language/regex/range-bound-ffff_test.dart b/tests/language/regex/range-bound-ffff_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a1e11a74574cd8c0d2b6a72600f1508f74fd9ec7
--- /dev/null
+++ b/tests/language/regex/range-bound-ffff_test.dart
@@ -0,0 +1,14 @@
+// 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(
+  'Test for rdar:/68455379, a case-insensitive regex containing a character class containing a range with an upper bound of \uFFFF can lead to an infinite-loop.'
+  );
+
+  shouldBe(firstMatch("A", new RegExp(r"[\u0001-\uFFFF]", caseSensitive: false)), ["A"]);
+}