Dart VM: Simplify code generation for equality operators.

runtime/vm/parser.h

 // 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.
 
 #ifndef VM_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "lib/invocation_mirror.h"
@@ skipping 641 matching lines @@
                                 const String* left_ident,
                                 intptr_t left_pos);
   AstNode* InsertClosureCallNodes(AstNode* condition);
 
   ConstructorCallNode* CreateConstructorCallNode(
       intptr_t token_pos,
       const AbstractTypeArguments& type_arguments,
       const Function& constructor,
       ArgumentListNode* arguments);
 
+  void AddEqualityNullCheck();
+
   RawInstance* TryCanonicalize(const Instance& instance, intptr_t token_pos);
 
   Isolate* isolate() const { return isolate_; }
 
   Isolate* isolate_;  // Cached current isolate.
 
   Script& script_;
   TokenStream::Iterator tokens_iterator_;
   Token::Kind token_kind_;  // Cached token kind for current token.
   Block* current_block_;
@@ skipping 40 matching lines @@
   intptr_t last_used_try_index_;
 
   bool unregister_pending_function_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_