Fix inconsistent equality with doubles and large integers on ia32.

tests/language/large_integer_equality_vm_test.dart

Index: tests/language/large_integer_equality_vm_test.dart
===================================================================
--- tests/language/large_integer_equality_vm_test.dart	(revision 0)
+++ tests/language/large_integer_equality_vm_test.dart	(revision 0)
@@ -0,0 +1,11 @@
+// Copyright (c) 2013, 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";
+
+main() {
+  var x = 81985529216486895;
+  Expect.isTrue(x == x.toDouble());
+  Expect.isTrue(x.toDouble() == x);
+}