Create ast/ and parsing/ subdirectories and move appropriate files

src/ast/ast-expression-visitor.h

Index: src/ast/ast-expression-visitor.h
diff --git a/src/ast-expression-visitor.h b/src/ast/ast-expression-visitor.h
similarity index 86%
rename from src/ast-expression-visitor.h
rename to src/ast/ast-expression-visitor.h
index a4bf34d63fe9463495db015cb2c0524cb40298d7..cda624d5b7a45e214ed590bdf6920a2b3430ef7d 100644
--- a/src/ast-expression-visitor.h
+++ b/src/ast/ast-expression-visitor.h
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_AST_EXPRESSION_VISITOR_H_
-#define V8_AST_EXPRESSION_VISITOR_H_
+#ifndef V8_AST_AST_EXPRESSION_VISITOR_H_
+#define V8_AST_AST_EXPRESSION_VISITOR_H_
 
 #include "src/allocation.h"
-#include "src/ast.h"
+#include "src/ast/ast.h"
+#include "src/ast/scopes.h"
 #include "src/effects.h"
-#include "src/scopes.h"
 #include "src/type-info.h"
 #include "src/types.h"
 #include "src/zone.h"
@@ -47,4 +47,4 @@ class AstExpressionVisitor : public AstVisitor {
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_AST_EXPRESSION_VISITOR_H_
+#endif  // V8_AST_AST_EXPRESSION_VISITOR_H_