Port and integrate the irregexp engine from V8

tests/language/regex/norepeat_test.dart

Index: tests/language/regex/norepeat_test.dart
diff --git a/tests/language/deferred_only_constant_test.dart b/tests/language/regex/norepeat_test.dart
similarity index 55%
copy from tests/language/deferred_only_constant_test.dart
copy to tests/language/regex/norepeat_test.dart
index e50d7ba6a1537a687787b7659fb528b57ce85746..311212e28d0183047ff7fd0db8fc4c3b0f9f875e 100644
--- a/tests/language/deferred_only_constant_test.dart
+++ b/tests/language/regex/norepeat_test.dart
@@ -2,14 +2,15 @@
 // 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.
 
-// Testing import of only constants from a deferred library.
-
+import 'util.dart';
 import 'package:expect/expect.dart';
 
-import "deferred_only_constant_lib.dart" deferred as lib;
-
 void main() {
-  lib.loadLibrary().then((_) {
-    Expect.equals(lib.constant, const ["a", "b", "c"]);
-  });
-}
+  description(
+  'Test for https:new RegExp(r"/bugs.webkit.org")show_bug.cgi?id=46077'
+  );
+
+  var re = new RegExp(r"^b|^cd");
+  var str = "abcd";
+  shouldBeFalse(re.hasMatch(str));
+}