Create ast/ and parsing/ subdirectories and move appropriate files

src/x64/codegen-x64.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_X64_CODEGEN_X64_H_
 #define V8_X64_CODEGEN_X64_H_
 
-#include "src/ast.h"
+#include "src/ast/ast.h"
 #include "src/macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 
 class StringCharLoadGenerator : public AllStatic {
  public:
   // Generates the code for handling different string types and loading the
   // indexed character into |result|.  We expect |index| as untagged input and
@@ skipping 86 matching lines @@
   const int extra_displacement_to_last_argument_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StackArgumentsAccessor);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X64_CODEGEN_X64_H_