* mt-tdep.c (enum mt_gdb_regnums): Add MT_COPRO_PSEUDOREG_ARRAY,
MT_COPRO_PSEUDOREG_DIM_1, MT_COPRO_PSEUDOREG_DIM_2,
MT_COPRO_PSEUDOREG_REGS members. Adjust MT_NUM_PSEUDO_REGS.
(mt_register_name): Lazily synthesize name for coprocessor pseudo
array registers.
(mt_copro_register_type): New. Broken out of ...
(mt_register_type): ... here. Use it. Deal with coprocessor
pseudo array.
(mt_select_coprocessor): New.
(mt_pseudo_register_read, mt_pseudo_register_write): Deal with
coprocessor pseudo array.