docs: private void addDelegateFields() {
          visitField(ACC_PRIVATE + ACC_FINAL, CLOSURES_MAP_FIELD, "Ljava/util/Map;", null, null);
          if (generateDelegateField) {
              visitField(ACC_PRIVATE + ACC_FINAL, DELEGATE_OBJECT_FIELD, BytecodeHelper.getTypeDescription(delegateClass), null, null);
          }
      }