PR preprocessor/83708
* macro.c (vaopt_state): Reorder m_last_was_paste before m_state.
(vaopt_state::vaopt_state): Adjust.
(vaopt_state::update_flags): Add BEGIN and END.
(vaopt_state::update): Return them.
(copy_paste_flag): Factor out of replace_args.
(last_token_is): New.
(replace_args): Handle BEGIN and END. Avoid padding there.
(tokens_buff_last_token_ptr): Return NULL if no tokens.
Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
From-SVN: r257696