Remove dead helper methods from Block AST node

src/ast.h

 // 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.
 
 #ifndef V8_AST_H_
 #define V8_AST_H_
 
 #include "src/assembler.h"
 #include "src/ast-value-factory.h"
 #include "src/bailout-reason.h"
@@ skipping 440 matching lines @@
   BreakableType breakable_type_;
   Label break_target_;
   int base_id_;
 };
 
 
 class Block final : public BreakableStatement {
  public:
   DECLARE_NODE_TYPE(Block)
 
-  void AddStatement(Statement* statement, Zone* zone) {
-    statements_.Add(statement, zone);
-  }
-
-  void InsertStatementAt(int index, Statement* statement, Zone* zone) {
-    statements_.InsertAt(index, statement, zone);
-  }
-
   ZoneList<Statement*>* statements() { return &statements_; }
   bool ignore_completion_value() const { return ignore_completion_value_; }
 
   static int num_ids() { return parent_num_ids() + 1; }
   BailoutId DeclsId() const { return BailoutId(local_id(0)); }
 
   bool IsJump() const override {
     return !statements_.is_empty() && statements_.last()->IsJump()
         && labels() == NULL;  // Good enough as an approximation...
   }
@@ skipping 3139 matching lines @@
   // the parser-level zone.
   Zone* parser_zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_H_