Fix for intrinsified Math.sqrt method, added test.

tests/language/src/IntrinsifiedMethodsTest.dart

Index: tests/language/src/IntrinsifiedMethodsTest.dart
===================================================================
--- tests/language/src/IntrinsifiedMethodsTest.dart	(revision 0)
+++ tests/language/src/IntrinsifiedMethodsTest.dart	(revision 0)
@@ -0,0 +1,16 @@
+// Copyright (c) 2011, 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 the instanceof operation.
+
+num foo(int n) {
+  var x;
+  for(var i = 0; i <= n; ++i)
+    x = Math.sqrt(i);
+  return x;
+}
+
+void main() {
+  var m = foo(40000);
+  print(m);
+}