Refactor the arguments access code to make it easier to read.

src/codegen.h

 // Copyright 2006-2008 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 339 matching lines @@
     NEW_OBJECT
   };
 
   explicit ArgumentsAccessStub(Type type) : type_(type) { }
 
  private:
   Type type_;
 
   Major MajorKey() { return ArgumentsAccess; }
   int MinorKey() { return type_; }
+
   void Generate(MacroAssembler* masm);
+  void GenerateReadLength(MacroAssembler* masm);
+  void GenerateReadElement(MacroAssembler* masm);
+  void GenerateNewObject(MacroAssembler* masm);
 
   const char* GetName() { return "ArgumentsAccessStub"; }
 
 #ifdef DEBUG
   void Print() {
     PrintF("ArgumentsAccessStub (type %d)\n", type_);
   }
 #endif
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_