Handle instance fields in compile_from_dill_test

pkg/compiler/lib/src/elements/common.dart

 // Copyright (c) 2015, 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.
 
 /// Mixins that implement convenience methods on [Element] subclasses.
 
 library elements.common;
 
 import '../common/names.dart' show Identifiers, Names, Uris;
 import '../common_elements.dart' show CommonElements;
@@ skipping 396 matching lines @@
   }
 
   /**
    * Returns true if the [fieldMember] shadows another field.  The given
    * [fieldMember] must be a member of this class, i.e. if there is a field of
    * the same name in the superclass chain.
    *
    * This method also works if the [fieldMember] is private.
    */
   @override
-  bool hasFieldShadowedBy(Element fieldMember) {
+  bool hasFieldShadowedBy(FieldElement fieldMember) {
     assert(fieldMember.isField);
     String fieldName = fieldMember.name;
     bool isPrivate = Name.isPrivateName(fieldName);
     LibraryElement memberLibrary = fieldMember.library;
     ClassElement lookupClass = this.superclass;
     while (lookupClass != null) {
       Element foundMember = lookupClass.lookupLocalMember(fieldName);
       if (foundMember != null) {
         if (foundMember.isField) {
           if (!isPrivate || memberLibrary == foundMember.library) {
@@ skipping 241 matching lines @@
   @override
   bool get isBoolFromEnvironmentConstructor {
     return fromEnvironmentState == _FromEnvironmentState.BOOL;
   }
 
   @override
   bool get isStringFromEnvironmentConstructor {
     return fromEnvironmentState == _FromEnvironmentState.STRING;
   }
 }