[es6] Implement for-of iterator finalization

src/parsing/rewriter.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/rewriter.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/parsing/parser.h"
 
@@ skipping 13 matching lines @@
         factory_(ast_value_factory) {
     InitializeAstVisitor(isolate);
   }
 
   Processor(Parser* parser, Scope* scope, Variable* result,
             AstValueFactory* ast_value_factory)
       : result_(result),
         result_assigned_(false),
         replacement_(nullptr),
         is_set_(false),
+        zone_(ast_value_factory->zone()),
         scope_(scope),
         factory_(ast_value_factory) {
     InitializeAstVisitor(parser->stack_limit());
   }
 
   ~Processor() override {}
 
   void Process(ZoneList<Statement*>* statements);
   bool result_assigned() const { return result_assigned_; }
 
@@ skipping 351 matching lines @@
           processor.SetResult(undef), expr->position());
       body->Add(completion, factory->zone());
     }
   }
   return true;
 }
 
 
 }  // namespace internal
 }  // namespace v8