Fix disassembler crash when mistaking integer values for objects.

tests/language/disasssemble_test.dart

Index: tests/language/disasssemble_test.dart
===================================================================
--- tests/language/disasssemble_test.dart	(revision 0)
+++ tests/language/disasssemble_test.dart	(working copy)
@@ -0,0 +1,17 @@
+// Copyright (c) 2014, 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.
+// Dart test program for testing isolate communication with
+// typed objects.
+// VMOptions=--disassemble
+
+// Tests proper object recognition in disassembler.
+
+f(x) {
+ return "foo";
+}
+
+main() {
+ print(f(0));
+}
+