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

src/codegen.cc

 // Copyright 2007-2008 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 344 matching lines @@
 const char* RuntimeStub::GetName() {
   return Runtime::FunctionForId(id_)->stub_name;
 }
 
 
 void RuntimeStub::Generate(MacroAssembler* masm) {
   masm->TailCallRuntime(ExternalReference(id_), num_arguments_);
 }
 
 
+void ArgumentsAccessStub::Generate(MacroAssembler* masm) {
+  switch (type_) {
+    case READ_LENGTH: GenerateReadLength(masm); break;
+    case READ_ELEMENT: GenerateReadElement(masm); break;
+    case NEW_OBJECT: GenerateNewObject(masm); break;
+  }
+}
+
+
 } }  // namespace v8::internal