Remove unused Zone argument from InitializeAstVisitor

src/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/rewriter.h"
 
 #include "src/ast.h"
 #include "src/parser.h"
 #include "src/scopes.h"
 
 namespace v8 {
 namespace internal {
 
 class Processor: public AstVisitor {
  public:
   Processor(Isolate* isolate, 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(isolate, ast_value_factory->zone());
+    InitializeAstVisitor(isolate);
   }
 
   virtual ~Processor() { }
 
   void Process(ZoneList<Statement*>* statements);
   bool result_assigned() const { return result_assigned_; }
 
+  Zone* zone() { return zone_; }
   Scope* scope() { return scope_; }
   AstNodeFactory* factory() { return &factory_; }
 
  private:
   Variable* result_;
 
   // We are not tracking result usage via the result_'s use
   // counts (we leave the accurate computation to the
   // usage analyzer). Instead we simple remember if
   // there was ever an assignment to result_.
   bool result_assigned_;
 
   // When visiting a node, we "return" a replacement for that node in
   // [replacement_].  In many cases this will just be the original node.
   Statement* replacement_;
 
   // To avoid storing to .result all the time, we eliminate some of
   // the stores by keeping track of whether or not we're sure .result
   // will be overwritten anyway. This is a bit more tricky than what I
   // was hoping for.
   bool is_set_;
 
+  Zone* zone_;
   Scope* scope_;
   AstNodeFactory factory_;
 
   // Returns ".result = value"
   Expression* SetResult(Expression* value) {
     result_assigned_ = true;
     VariableProxy* result_proxy = factory()->NewVariableProxy(result_);
     return factory()->NewAssignment(
         Token::ASSIGN, result_proxy, value, RelocInfo::kNoPosition);
   }
@@ skipping 290 matching lines @@
       body->Add(result_statement, info->zone());
     }
   }
 
   return true;
 }
 
 
 }  // namespace internal
 }  // namespace v8