Create ast/ and parsing/ subdirectories and move appropriate files

src/parsing/expression-classifier.h

 // Copyright 2015 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_EXPRESSION_CLASSIFIER_H
-#define V8_EXPRESSION_CLASSIFIER_H
+#ifndef V8_PARSING_EXPRESSION_CLASSIFIER_H
+#define V8_PARSING_EXPRESSION_CLASSIFIER_H
 
 #include "src/messages.h"
-#include "src/scanner.h"
-#include "src/token.h"
+#include "src/parsing/scanner.h"
+#include "src/parsing/token.h"
 
 namespace v8 {
 namespace internal {
 
 
 class ExpressionClassifier {
  public:
   struct Error {
     Error()
         : location(Scanner::Location::invalid()),
@@ skipping 273 matching lines @@
   Error duplicate_formal_parameter_error_;
   Error strict_mode_formal_parameter_error_;
   Error strong_mode_formal_parameter_error_;
   Error let_pattern_error_;
   DuplicateFinder* duplicate_finder_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_EXPRESSION_CLASSIFIER_H
+#endif  // V8_PARSING_EXPRESSION_CLASSIFIER_H