Fixes ABI bug in MIPS.

samples/sample_extension/sample_synchronous_extension_no_autoscope.dart

Index: samples/sample_extension/sample_synchronous_extension_no_autoscope.dart
===================================================================
--- samples/sample_extension/sample_synchronous_extension_no_autoscope.dart	(revision 0)
+++ samples/sample_extension/sample_synchronous_extension_no_autoscope.dart	(revision 0)
@@ -0,0 +1,11 @@
+// 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.
+
+library sample_synchronous_extension_no_autoscope;
+
+import 'dart-ext:sample_extension_no_autoscope';
+
+// The simplest way to call native code: top-level functions.
+int systemRand() native "SystemRand";
+bool systemSrand(int seed) native "SystemSrand";