page_zip_compress(), page_zip_compress_write_log(),
page_zip_copy_recs(): Replace the parameters page,page_zip with block,
and set buf_page_t::init_on_flush on success
if innodb_log_optimize_ddl=OFF.

page_zip_parse_compress_no_data(): Merge with the only caller
recv_parse_or_apply_log_rec_body().