Create ast/ and parsing/ subdirectories and move appropriate files

src/compiler/ast-loop-assignment-analyzer.h

 // Copyright 2014 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_COMPILER_AST_LOOP_ASSIGNMENT_ANALYZER_H_
 #define V8_COMPILER_AST_LOOP_ASSIGNMENT_ANALYZER_H_
 
-#include "src/ast.h"
+#include "src/ast/ast.h"
 #include "src/bit-vector.h"
 #include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 
 class Variable;
 class Scope;
 
 namespace compiler {
@@ skipping 50 matching lines @@
   void AnalyzeAssignment(Variable* var);
 
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
   DISALLOW_COPY_AND_ASSIGN(AstLoopAssignmentAnalyzer);
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_AST_LOOP_ASSIGNMENT_ANALYZER_H_