Fixes for using _DeferredClassElement and SDK summary.

pkg/analyzer/lib/src/generated/element_resolver.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.
 
 library analyzer.src.generated.element_resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 1100 matching lines @@
     //
     if (node.parent is Annotation) {
       Annotation annotation = node.parent as Annotation;
       _resolveAnnotationElement(annotation);
     }
     return null;
   }
 
   @override
   Object visitSuperConstructorInvocation(SuperConstructorInvocation node) {
-    ClassElementImpl enclosingClass = _resolver.enclosingClass;
+    ClassElementImpl enclosingClass =
+        ClassElementImpl.getImpl(_resolver.enclosingClass);
     if (enclosingClass == null) {
       // TODO(brianwilkerson) Report this error.
       return null;
     }
     InterfaceType superType = enclosingClass.supertype;
     if (superType == null) {
       // TODO(brianwilkerson) Report this error.
       return null;
     }
     SimpleIdentifier name = node.constructorName;
@@ skipping 1452 matching lines @@
 
   @override
   Element get staticElement => null;
 
   @override
   dynamic/*=E*/ accept/*<E>*/(AstVisitor/*<E>*/ visitor) => null;
 
   @override
   void visitChildren(AstVisitor visitor) {}
 }