Fixes ABI bug in MIPS.

samples/sample_extension/test_sample_synchronous_extension_no_autoscope.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.
+
+library test_sample_extension_no_autoscope;
+
+import 'sample_synchronous_extension_no_autoscope.dart';
+
+void check(bool condition, String message) {
+  if (!condition) {
+    throw new StateError(message);
+  }
+}
+
+void main() {
+  systemSrand(17);
+  var x1 = systemRand();
+  var x2 = systemRand();
+  var x3 = systemRand();
+  check(x1 != x2, "x1 != x2");
+  check(x1 != x3, "x1 != x3");
+  check(x2 != x3, "x2 != x3");
+  systemSrand(17);
+  check(x1 == systemRand(), "x1 == systemRand()");
+  check(x2 == systemRand(), "x2 == systemRand()");
+  check(x3 == systemRand(), "x3 == systemRand()");
+  systemSrand(18);
+  check(x1 != systemRand(), "x1 != systemRand()");
+  check(x2 != systemRand(), "x2 != systemRand()");
+  check(x3 != systemRand(), "x3 != systemRand()");
+}