Fix unit tests.

tests/compiler/dart2js/constant_folding_test.dart

 // Copyright (c) 2012, 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.
 // Test constant folding on numbers.
 
 import "package:expect/expect.dart";
 import 'compiler_helper.dart';
 
 const String NUMBER_FOLDING = """
 void main() {
@@ skipping 63 matching lines @@
   regexp = new RegExp('"foo" === d');
   Expect.isTrue(regexp.hasMatch(generated));
 
   compileAndMatch(
       LIST_LENGTH_FOLDING, 'foo', new RegExp(r"return 3"));
 
   compileAndMatch(
       LIST_INDEX_FOLDING, 'foo', new RegExp(r"return 1"));
 
   compileAndDoNotMatch(
-      LIST_INDEX_FOLDING, 'foo', new RegExp(r"throw"));
+      LIST_INDEX_FOLDING, 'foo', new RegExp(r"ioore"));
 
   compileAndMatch(
       STRING_LENGTH_FOLDING, 'foo', new RegExp(r"return 3"));
 
   compileAndMatch(
-      RANGE_ERROR_INDEX_FOLDING, 'foo', new RegExp(r"throw"));
+      RANGE_ERROR_INDEX_FOLDING, 'foo', new RegExp(r"ioore"));
 }