* remote.c (struct packet_reg): Declare.

* remote.c (struct packet_reg): Declare.
(struct remote_state): Add fields sizeof_g_packet and g_packet.
(init_remote_state): Initialize sizeof_g_packet and g_packet.
(free_remote_state): Free g_packet.
(packet_reg_from_pnum, packet_reg_by_regnum): New functions.
(remote_wait): Use above instead of gdbarch methods
REGISTER_RAW_SIZE and REGISTER_BYTES.
(remote_async_wait): Ditto.
(remote_fetch_registers, remote_store_registers): Ditto.
(store_register_using_P): Ditto.