Remove AstConstructionVisitor/AstNullVisitor

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/v8.h"
 
 #include "src/rewriter.h"
 
 #include "src/ast.h"
 #include "src/compiler.h"
@@ skipping 11 matching lines @@
         in_try_(false),
         factory_(ast_value_factory) {
     InitializeAstVisitor(ast_value_factory->zone());
   }
 
   virtual ~Processor() { }
 
   void Process(ZoneList<Statement*>* statements);
   bool result_assigned() const { return result_assigned_; }
 
-  AstNodeFactory<AstNullVisitor>* factory() {
-    return &factory_;
-  }
+  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_;
 
   // 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_;
   bool in_try_;
 
-  AstNodeFactory<AstNullVisitor> factory_;
+  AstNodeFactory factory_;
 
   Expression* SetResult(Expression* value) {
     result_assigned_ = true;
     VariableProxy* result_proxy = factory()->NewVariableProxy(result_);
     return factory()->NewAssignment(
         Token::ASSIGN, result_proxy, value, RelocInfo::kNoPosition);
   }
 
   // Node visitors.
 #define DEF_VISIT(type) \
@@ skipping 194 matching lines @@
           processor.factory()->NewReturnStatement(result_proxy, pos);
       body->Add(result_statement, info->zone());
     }
   }
 
   return true;
 }
 
 
 } }  // namespace v8::internal