Fix bad precedence for >>> operator.

tests/language/positive_bit_operations_test.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.
 
 constants() {
   Expect.equals(0x80000000, 0x80000000 | 0);
   Expect.equals(0x80000001, 0x80000000 | 1);
   Expect.equals(0x80000000, 0x80000000 | 0x80000000);
   Expect.equals(0xFFFFFFFF, 0xFFFF0000 | 0xFFFF);
   Expect.equals(0x80000000, 0x80000000 & 0xFFFFFFFF);
@@ skipping 90 matching lines @@
     Expect.equals(0xFFFFFFFC,
                   ((((((m << 4) // 0xFFFFFFF0
                           >> 1) // 0x7FFFFFF8
                           | 0x80000000) // 0xFFFFFFF8
                           >> 2) // 0x3FFFFFFE
                           ^ 0x40000000) // 0x7FFFFFFE
                           << 1));
   }
 }
 
+// Due to bad precedence rules this example was broken in Dart2Js.
+precedence() {
+  Expect.equals(0x80000000, -1 & 0x80000000);
+  Expect.equals(0x80000000, id(-1) & 0x80000000);
+  Expect.equals(0x80000000, ~(~(0x80000000)));
+  Expect.equals(0x80000000, ~(~(id(0x80000000))));
+}
+
 main() {
   constants();
   interceptors();
   speculative();
+  precedence();
 }