Encode super calls via extra properties on prototypes.

pkg/compiler/lib/src/js_emitter/old_emitter/reflection_data_parser.dart

 // Copyright (c) 2013, 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.
 
 part of dart2js.js_emitter;
 
 // TODO(ahe): Share these with js_helper.dart.
 const FUNCTION_INDEX = 0;
 const NAME_INDEX = 1;
 const CALL_NAME_INDEX = 2;
@@ skipping 125 matching lines @@
 ''', [typeInformationAccess, globalFunctionsAccess, staticsAccess]);
 
 
   /**
    * See [dart2js.js_emitter.ContainerBuilder.addMemberMethod] for format of
    * [array].
    */
   jsAst.Statement addStubs = js.statement('''
   function addStubs(descriptor, array, name, isStatic,
                     originalDescriptor, functions) {
-    var f, funcs =
-        [originalDescriptor[name] =
-        descriptor[name] = f = ${readFunction("array", "$FUNCTION_INDEX")}];
+    var index = $FUNCTION_INDEX, alias = array[index], f;
+    if (typeof alias == "string") {
+      f = array[++index];
+    } else {
+      f = alias;
+      alias = name;
+    }
+    var funcs = [originalDescriptor[name] = descriptor[name] =
+        descriptor[alias] = f];
     f.\$stubName = name;
     functions.push(name);
-    for (var index = $FUNCTION_INDEX; index < array.length; index += 2) {
+    for (; index < array.length; index += 2) {
       f = array[index + 1];
       if (typeof f != "function") break;
       f.\$stubName = ${readString("array", "index + 2")};
       funcs.push(f);
       if (f.\$stubName) {
         originalDescriptor[f.\$stubName] = descriptor[f.\$stubName] = f;
         functions.push(f.\$stubName);
       }
     }
     for (var i = 0; i < funcs.length; index++, i++) {
@@ skipping 238 matching lines @@
 (function() {
   var result = $array[$index];
   if ($check) {
     throw new Error(
         name + ": expected value of type \'$type\' at index " + ($index) +
         " but got " + (typeof result));
   }
   return result;
 })()''';
 }