Create ast/ and parsing/ subdirectories and move appropriate files

test/cctest/expression-type-collector.cc

 // 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.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include "src/v8.h"
 
 #include "test/cctest/expression-type-collector.h"
 
-#include "src/ast.h"
+#include "src/ast/ast.h"
+#include "src/ast/scopes.h"
 #include "src/codegen.h"
-#include "src/scopes.h"
 
 namespace v8 {
 namespace internal {
 namespace {
 
 struct {
   AstNode::NodeType type;
   const char* name;
 } NodeTypeNameList[] = {
 #define DECLARE_VISIT(type)   \
@@ skipping 32 matching lines @@
     if (NodeTypeNameList[i].type == type) {
       e.kind = NodeTypeNameList[i].name;
       break;
     }
   }
   result_->push_back(e);
 }
 
 }  // namespace internal
 }  // namespace v8