Made dart2js constructor lookup logic "private"-aware, fixed 4740 bug.

lib/compiler/implementation/compile_time_constants.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.
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
  */
 class ConstantHandler extends CompilerTask {
@@ skipping 751 matching lines @@
     }
 
     if (!foundSuperOrRedirect) {
       // No super initializer found. Try to find the default constructor if
       // the class is not Object.
       ClassElement enclosingClass = constructor.getEnclosingClass();
       ClassElement superClass = enclosingClass.superclass;
       if (enclosingClass != compiler.objectClass) {
         assert(superClass !== null);
         assert(superClass.resolutionState == STATE_DONE);
+
+        Selector selector =
+            new Selector.callDefaultConstructor(superClass.name,
+                                                enclosingClass.getLibrary());
         FunctionElement targetConstructor =
-            superClass.lookupConstructor(superClass.name);
+            superClass.lookupConstructor(selector);
         if (targetConstructor === null) {
           compiler.internalError("no default constructor available",
                                  node: functionNode);
         }
 
-        Selector selector = new Selector.call(superClass.name,
-                                              enclosingClass.getLibrary(),
-                                              0);
         evaluateSuperOrRedirectSend(functionNode,
                                     selector,
                                     const EmptyLink<Node>(),
                                     targetConstructor);
       }
     }
   }
 
   /**
    * Simulates the execution of the [constructor] with the given
@@ skipping 16 matching lines @@
       Constant fieldValue = fieldValues[field];
       if (fieldValue === null) {
         // Use the default value.
         fieldValue = compiler.compileConstant(field);
       }
       jsNewArguments.add(fieldValue);
     });
     return jsNewArguments;
   }
 }