Remove unused Zone argument from InitializeAstVisitor

src/typing-asm.h

 // Copyright 2015 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_TYPING_ASM_H_
 #define V8_TYPING_ASM_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/effects.h"
 #include "src/type-info.h"
 #include "src/types.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 class ZoneTypeCache;
 
 class AsmTyper : public AstVisitor {
  public:
   explicit AsmTyper(Isolate* isolate, Zone* zone, Script* script,
                     FunctionLiteral* root);
   bool Validate();
   const char* error_message() { return error_message_; }
 
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
 
  private:
+  Zone* zone_;
   Script* script_;
   FunctionLiteral* root_;
   bool valid_;
 
   // Information for bi-directional typing with a cap on nesting depth.
   Type* expected_type_;
   Type* computed_type_;
   int intish_;  // How many ops we've gone without a x|0.
 
   Type* return_type_;  // Return type of last function.
@@ skipping 36 matching lines @@
   Type* GetType(Variable* variable);
 
   Type* LibType(ObjectTypeMap map, Handle<String> name);
 
   void SetResult(Expression* expr, Type* type);
   void IntersectResult(Expression* expr, Type* type);
 
   void VisitWithExpectation(Expression* expr, Type* expected_type,
                             const char* msg);
 
+  Zone* zone() const { return zone_; }
+
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node) override;
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
   DISALLOW_COPY_AND_ASSIGN(AsmTyper);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TYPING_ASM_H_