Remove variable rewrites and the unneccesary Slot class.

src/prettyprinter.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 34 matching lines @@
   // The result string is alive as long as the PrettyPrinter is alive.
   const char* Print(AstNode* node);
   const char* PrintExpression(FunctionLiteral* program);
   const char* PrintProgram(FunctionLiteral* program);
 
   void Print(const char* format, ...);
 
   // Print a node to stdout.
   static void PrintOut(AstNode* node);
 
-  virtual void VisitSlot(Slot* node);
   // Individual nodes
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
  private:
   char* output_;  // output string buffer
   int size_;  // output_ size
   int pos_;  // current printing position
 
@@ skipping 14 matching lines @@
 
 // Prints the AST structure
 class AstPrinter: public PrettyPrinter {
  public:
   AstPrinter();
   virtual ~AstPrinter();
 
   const char* PrintProgram(FunctionLiteral* program);
 
   // Individual nodes
-  virtual void VisitSlot(Slot* node);
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
  private:
   friend class IndentedScope;
   void PrintIndented(const char* txt);
   void PrintIndentedVisit(const char* s, AstNode* node);
 
   void PrintStatements(ZoneList<Statement*>* statements);
@@ skipping 55 matching lines @@
   AttributesScope* attributes() { return attributes_scope_; }
   void set_attributes(AttributesScope* scope) { attributes_scope_ = scope; }
 
   // Add an attribute to the currently opened attributes.
   void AddAttribute(const char* name, Handle<String> value);
   void AddAttribute(const char* name, const char* value);
   void AddAttribute(const char* name, int value);
   void AddAttribute(const char* name, bool value);
 
   // AST node visit functions.
-  virtual void VisitSlot(Slot* node);
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
  private:
   int indent_;
   TagScope* top_tag_scope_;
   AttributesScope* attributes_scope_;
 
   // Utility function used by AddAttribute implementations.
@@ skipping 37 matching lines @@
  private:
   JsonAstBuilder* builder_;
   int attribute_count_;
 };
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_PRETTYPRINTER_H_