Add corelib tests

test/codegen/corelib/regexp/issue_19193_test.dart

 // Copyright (c) 2015, 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 'package:expect/expect.dart';
 
-class Foo {
-  var field = 10;
+// Regression test for http://dartbug.com/19193
+main() {
+  RegExp re = new RegExp(r'.*(a+)+\d');
+  Expect.isTrue("a0aaaaaaaaaaaaa".contains(re));
+  Expect.isTrue("a0aaaaaaaaaaaaaa".contains(re)); // false when using JSCRE.
 }
-
-@NoInline()
-getField(x) {
-  x.field;
-  return 34;
-}
-
-main() {
-  Expect.equals(34, getField(new Foo()));
-  Expect.throws(() => getField(null));
-}