Remove unused Zone argument from InitializeAstVisitor

src/interpreter/bytecode-generator.h

Index: src/interpreter/bytecode-generator.h
diff --git a/src/interpreter/bytecode-generator.h b/src/interpreter/bytecode-generator.h
index d5143d5240416dfe6490676df3b24384ff3553ab..3b8e82776033b3825187f9548636f180757cecde 100644
--- a/src/interpreter/bytecode-generator.h
+++ b/src/interpreter/bytecode-generator.h
@@ -55,6 +55,7 @@ class BytecodeGenerator : public AstVisitor {
   inline BytecodeArrayBuilder* builder() { return &builder_; }
 
   inline Isolate* isolate() const { return isolate_; }
+  inline Zone* zone() const { return zone_; }
 
   inline Scope* scope() const { return scope_; }
   inline void set_scope(Scope* scope) { scope_ = scope; }
@@ -74,6 +75,7 @@ class BytecodeGenerator : public AstVisitor {
   int feedback_index(FeedbackVectorSlot slot) const;
 
   Isolate* isolate_;
+  Zone* zone_;
   BytecodeArrayBuilder builder_;
   CompilationInfo* info_;
   Scope* scope_;