Further cleanup of element use in type_graph_nodes

pkg/compiler/lib/src/types/dictionary_type_mask.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.
 
 part of masks;
 
 /**
  * A [DictionaryTypeMask] is a [TypeMask] for a specific allocation
  * site of a map (currently only internal Map class) that is used as
  * a dictionary, i.e. a mapping from a set of statically known strings
  * to values. These typemasks only come into existence after the
  * [TypeGraphInferrer] has successfully identified such a usage. Otherwise,
  * the more general [MapTypeMask] is used.
  */
 class DictionaryTypeMask extends MapTypeMask {
   // The underlying key/value map of this dictionary.
   final Map<String, TypeMask> typeMap;
 
-  DictionaryTypeMask(forwardTo, allocationNode, allocationElement, keyType,
-      valueType, this.typeMap)
+  DictionaryTypeMask(
+      TypeMask forwardTo,
+      Node allocationNode,
+      MemberEntity allocationElement,
+      TypeMask keyType,
+      TypeMask valueType,
+      this.typeMap)
       : super(forwardTo, allocationNode, allocationElement, keyType, valueType);
 
   TypeMask nullable() {
     return isNullable
         ? this
         : new DictionaryTypeMask(forwardTo.nullable(), allocationNode,
             allocationElement, keyType, valueType, typeMap);
   }
 
   TypeMask nonNullable() {
@@ skipping 64 matching lines @@
   bool operator ==(other) => super == other;
 
   int get hashCode {
     return computeHashCode(allocationNode, isNullable, typeMap, forwardTo);
   }
 
   String toString() {
     return 'Dictionary mask: [$keyType/$valueType with $typeMap] type: $forwardTo';
   }
 }