[cleanup] Split ForOf and ForIn AST nodes apart as they share little

src/parsing/parser.cc

 // Copyright 2012 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.
 
 #include "src/parsing/parser.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-rewriter.h"
 #include "src/ast/ast-expression-visitor.h"
@@ skipping 3094 matching lines @@
           scope_);
       auto block =
           factory()->NewBlock(nullptr, 2, false, RelocInfo::kNoPosition);
       block->statements()->Add(factory()->NewExpressionStatement(
                                    assign_each, RelocInfo::kNoPosition),
                                zone());
       block->statements()->Add(body, zone());
       body = block;
       each = factory()->NewVariableProxy(temp);
     }
-    stmt->Initialize(each, subject, body);
+    stmt->AsForInStatement()->Initialize(each, subject, body);
   }
 }
 
 void Parser::InitializeForOfStatement(ForOfStatement* for_of, Expression* each,
                                       Expression* iterable, Statement* body,
                                       int next_result_pos) {
   Variable* iterator =
       scope_->NewTemporary(ast_value_factory()->dot_iterator_string());
   Variable* result =
       scope_->NewTemporary(ast_value_factory()->dot_result_string());
@@ skipping 36 matching lines @@
     Expression* result_value = factory()->NewProperty(
         result_proxy, value_literal, RelocInfo::kNoPosition);
     assign_each = factory()->NewAssignment(Token::ASSIGN, each, result_value,
                                            RelocInfo::kNoPosition);
     if (each->IsArrayLiteral() || each->IsObjectLiteral()) {
       assign_each = PatternRewriter::RewriteDestructuringAssignment(
           this, assign_each->AsAssignment(), scope_);
     }
   }
 
-  for_of->Initialize(each, iterable, body, iterator, assign_iterator,
-                     next_result, result_done, assign_each);
+  for_of->Initialize(body, iterator, assign_iterator, next_result, result_done,
+                     assign_each);
 }
 
 Statement* Parser::DesugarLexicalBindingsInForStatement(
     Scope* inner_scope, VariableMode mode, ZoneList<const AstRawString*>* names,
     ForStatement* loop, Statement* init, Expression* cond, Statement* next,
     Statement* body, bool* ok) {
   // ES6 13.7.4.8 specifies that on each loop iteration the let variables are
   // copied into a new environment.  Moreover, the "next" statement must be
   // evaluated not in the environment of the just completed iteration but in
   // that of the upcoming one.  We achieve this with the following desugaring.
@@ skipping 3632 matching lines @@
                         try_block, target);
     final_loop = target;
   }
 
   return final_loop;
 }
 
 
 }  // namespace internal
 }  // namespace v8