Create ast/ and parsing/ subdirectories and move appropriate files

src/dateparser.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_DATEPARSER_H_
 #define V8_DATEPARSER_H_
 
 #include "src/allocation.h"
 #include "src/char-predicates.h"
-#include "src/scanner.h"
+#include "src/parsing/scanner.h"
 
 namespace v8 {
 namespace internal {
 
 class DateParser : public AllStatic {
  public:
   // Parse the string as a date. If parsing succeeds, return true after
   // filling out the output array as follows (all integers are Smis):
   // [0]: year
   // [1]: month (0 = Jan, 1 = Feb, ...)
@@ skipping 340 matching lines @@
   static DateParser::DateToken ParseES5DateTime(
       DateStringTokenizer<Char>* scanner, DayComposer* day, TimeComposer* time,
       TimeZoneComposer* tz);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DATEPARSER_H_