Add Uint32 representation

tests/language/vm/uint32_add_test.dart

+// 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.
+// Tests that the VM does not crash on weird corner cases of class Math.

[Florian Schneider, 2014/07/10 13:05:05]

Update description of this test.

[Cutch, 2014/07/10 17:12:53]

Done.

+// VMOptions=--optimization_counter_threshold=10
+
+import 'package:expect/expect.dart';
+
+trunc(x) => x & 0xFFFFFFFF;
+
+f(t, x) => t(x) + 1;
+
+g(t, x) => t(x + 1);

[Florian Schneider, 2014/07/10 13:05:05]

Also add a test case with larger expressions and check if all additions are
uint32.

e.g. 

(a + b + c + d) & 0xffffffff

[Cutch, 2014/07/10 17:12:53]

Done.

+
+main() {
+  for (var i = 0; i < 20000; i++) {
+    Expect.equals(0x100000000, f(trunc, 0xFFFFFFFF));
+    Expect.equals(0x0, g(trunc, 0xFFFFFFFF));
+  }
+}
+