fix analyzer failing to resolve loop variable nodes

pkg/analyzer/lib/src/dart/ast/utilities.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.dart.ast.utilities;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
@@ skipping 5734 matching lines @@
         _isEqualNodes(node.identifier, toNode.identifier));
   }
 
   @override
   bool visitForEachStatement(ForEachStatement node) {
     ForEachStatement toNode = this._toNode as ForEachStatement;
     return _and(
         _isEqualTokens(node.forKeyword, toNode.forKeyword),
         _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
         _isEqualNodes(node.loopVariable, toNode.loopVariable),
+        _isEqualNodes(node.identifier, toNode.identifier),
         _isEqualTokens(node.inKeyword, toNode.inKeyword),
         _isEqualNodes(node.iterable, toNode.iterable),
         _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
         _isEqualNodes(node.body, toNode.body));
   }
 
   @override
   bool visitFormalParameterList(FormalParameterList node) {
     FormalParameterList toNode = this._toNode as FormalParameterList;
     return _and(
@@ skipping 3425 matching lines @@
     if (node.star != null) {
       sink.write("yield* ");
     } else {
       sink.write("yield ");
     }
     safelyVisitNode(node.expression);
     sink.write(";");
     return null;
   }
 }