Use JavaScript runtime semantics when constant folding.

tests/language/canonical_const2_test.dart

Index: tests/language/canonical_const2_test.dart
diff --git a/samples/hi/hi.dart b/tests/language/canonical_const2_test.dart
similarity index 64%
copy from samples/hi/hi.dart
copy to tests/language/canonical_const2_test.dart
index 77cc144f834513f040b0496efde571b3ea84607a..02fb11e215b4ea3cc862c35f43dd4d506abb622c 100644
--- a/samples/hi/hi.dart
+++ b/tests/language/canonical_const2_test.dart
@@ -2,10 +2,8 @@
 // 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.
 
-#library('hi');
-
-#import('dart:html');
+// Check that compile-time constants are correctly canonicalized.
 
 main() {
-  document.query('#status').innerHTML = 'Hi, Dart';
+  Expect.isTrue(const <num>[1,2] !== const <num>[1.0,2.0]);
 }