Create ast/ and parsing/ subdirectories and move appropriate files

src/ast/modules.h

 // Copyright 2012 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_MODULES_H_
-#define V8_MODULES_H_
+#ifndef V8_AST_MODULES_H_
+#define V8_AST_MODULES_H_
 
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 
 class AstRawString;
 
 
@@ skipping 94 matching lines @@
 
   bool frozen_;
   ZoneHashMap* exports_;   // Module exports and their types (allocated lazily)
   ZoneList<const AstRawString*> requested_modules_;
   int index_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_MODULES_H_
+#endif  // V8_AST_MODULES_H_