Add support for superSend to the new IR and dart backend.

sdk/lib/_internal/compiler/implementation/dart_backend/dart_printer.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.
 
 // TODO(asgerf): Include metadata.
 // TODO(asgerf): Include cascade operator.
 library dart_printer;
 
 import '../dart2jslib.dart' as dart2js;
 import '../tree/tree.dart' as tree;
@@ skipping 526 matching lines @@
   Throw(this.expression);
 }
 
 class This extends Expression {
   static final This _instance = new This._create();
 
   factory This() => _instance;
   This._create();
 }
 
+class Super extends Expression {

[asgerf, 2014/06/23 10:55:17]

There is already a SuperReceiver class for this.

[sigurdm, 2014/06/24 09:23:08]

Thanks - don't know why I could not find it.

+  static final Super _instance = new Super._create();
+
+  factory Super() => _instance;
+  Super._create();
+}
+
 // UNPARSER
 
 bool isUnaryOperator(String op) {
   return op == '!' || op == '-' || op == '~';
 }
 bool isBinaryOperator(String op) {
   return BINARY_PRECEDENCE.containsKey(op);
 }
 /// True if the given operator can be converted to a compound assignment.
 bool isCompoundableOperator(String op) {
@@ skipping 944 matching lines @@
   final StringChunk previous;
   final tree.StringQuoting quoting;
   num cost;
 
   OpenStringChunk(this.previous, this.quoting, this.cost);
 
   StringChunk end(int endIndex) {
     return new StringChunk(previous, quoting, endIndex);
   }
 }