Create ast/ and parsing/ subdirectories and move appropriate files

src/parsing/parameter-initializer-rewriter.h

Index: src/parsing/parameter-initializer-rewriter.h
diff --git a/src/parameter-initializer-rewriter.h b/src/parsing/parameter-initializer-rewriter.h
similarity index 71%
rename from src/parameter-initializer-rewriter.h
rename to src/parsing/parameter-initializer-rewriter.h
index a195cb600ff7cca8e70718538d4fb4d6d8c39d61..255534c99e73a6cdc26a425ea5cc3f28235259b4 100644
--- a/src/parameter-initializer-rewriter.h
+++ b/src/parsing/parameter-initializer-rewriter.h
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_PARAMETER_EXPRESSION_REWRITER_H_
-#define V8_PARAMETER_EXPRESSION_REWRITER_H_
+#ifndef V8_PARSING_PARAMETER_EXPRESSION_REWRITER_H_
+#define V8_PARSING_PARAMETER_EXPRESSION_REWRITER_H_
 
-#include "src/ast.h"
+#include "src/ast/ast.h"
 
 namespace v8 {
 namespace internal {
@@ -19,4 +19,4 @@ void RewriteParameterInitializerScope(uintptr_t stack_limit,
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_PARAMETER_EXPRESSION_REWRITER_H_
+#endif  // V8_PARSING_PARAMETER_EXPRESSION_REWRITER_H_