* process.h (struct Lisp_Process): Replace Lisp_Objects `pid',

* process.h (struct Lisp_Process): Replace Lisp_Objects `pid',
`raw_status_high', and `raw_status_low' with plain integers, and move
them to the end of the structure.

* alloc.c (allocate_process): Use PSEUDOVECSIZE to initialize the
pseudovector's size field so only the Lisp_Object fields get GC'd.

* process.c (update_status, make_process, Fdelete_process)
(Fprocess_status, list_processes_1, start_process_unwind)
(create_process, Fmake_network_process, server_accept_connection)
(wait_reading_process_output, send_process, Fprocess_running_child_p)
(process_send_signal, proc_encode_coding_system, Fprocess_send_eof)
(sigchld_handler, status_notify): Adjust to new non-Lisp fields for
`pid' and `raw_status'.
(Fprocess_id, Fsignal_process): Same, and additionally use floats when
representing PIDs that are larger than most-positive-fixnum.