Remove support for >>> and >>>= operators in dartc

tests/language/src/UnsignedRightShiftTest.dart

Index: tests/language/src/UnsignedRightShiftTest.dart
diff --git a/tests/language/src/UnsignedRightShiftTest.dart b/tests/language/src/UnsignedRightShiftTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0b5d197f1517aeb3ae884e4b0ec5226d0f4be6cf
--- /dev/null
+++ b/tests/language/src/UnsignedRightShiftTest.dart
@@ -0,0 +1,12 @@
+// 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.
+
+// The >>> operator is not supported in Dart
+
+main() {
+  var foo = -10 
+    >>> 1 /// 01: compile-time error
+  ; 
+  foo >>>= 1; /// 02: compile-time error
+}