Remove old code generator.

runtime/vm/code_generator_x64.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_CODE_GENERATOR_X64_H_
-#define VM_CODE_GENERATOR_X64_H_
-
-#ifndef VM_CODE_GENERATOR_H_
-#error Do not include code_generator_x64.h directly; use code_generator.h.
-#endif
-
-#include "vm/ast.h"
-#include "vm/growable_array.h"
-
-namespace dart {
-
-// Forward declarations.
-class Assembler;
-class AstNode;
-class ParsedFunction;
-
-class CodeGenerator : public AstNodeVisitor {
- public:
-  CodeGenerator(Assembler* assembler, const ParsedFunction& parsed_function)
-      : pc_descriptors_list_(NULL) { }
-  virtual ~CodeGenerator() { }
-
-  bool GenerateCode() {
-    return false;
-  }
-
-  // Add exception handler table to code.
-  void FinalizeExceptionHandlers(const Code& code) { UNIMPLEMENTED(); }
-
-  // Add pc descriptors to code.
-  void FinalizePcDescriptors(const Code& code) { UNIMPLEMENTED(); }
-
-  // Add stack maps to code.
-  void FinalizeStackmaps(const Code& code) { UNIMPLEMENTED(); }
-
-  // Add local variable descriptors to code.
-  void FinalizeVarDescriptors(const Code& code) { UNIMPLEMENTED(); }
-
-  void FinalizeComments(const Code& code) { UNIMPLEMENTED(); }
-
-  // Allocate and return an arguments descriptor.
-  // Let 'num_names' be the length of 'optional_arguments_names'.
-  // Treat the first 'num_arguments - num_names' arguments as positional and
-  // treat the following 'num_names' arguments as named optional arguments.
-  static const Array& ArgumentsDescriptor(
-      int num_arguments,
-      const Array& optional_arguments_names);
-
-  // Return true if the VM may optimize functions.
-  static bool CanOptimize();
-
- private:
-  // Forward declarations.
-  class DescriptorList;
-
-  DescriptorList* pc_descriptors_list_;
-  DISALLOW_IMPLICIT_CONSTRUCTORS(CodeGenerator);
-};
-
-
-}  // namespace dart
-
-#endif  // VM_CODE_GENERATOR_X64_H_