message: expose Fold in swc_ecma_visit
diff: @@ -51,7 +51,7 @@ pub fn define(tts: proc_macro::TokenStream) -> proc_macro::TokenStream {
  let mut q = Quote::new_call_site();
  q.push_tokens(&make(Mode::Visitor, &block.stmts));
  - // q.push_tokens(&make(Mode::Folder, &block.stmts));
  + q.push_tokens(&make(Mode::Folder, &block.stmts));
  proc_macro2::TokenStream::from(q).into()
  }
  