* a29k-tdep.c (init_frame_info): Cast null arg to examine_tag.

* a29k-tdep.c (init_frame_info):  Cast null arg to examine_tag.
(pop_frame):  Restore PC2 and LR0 from dummy frames.
(push_dummy_frame):  Save PC2 and LR0 into dummy frames.
(setup_arbitrary_frame):  Handle 3 args and set up real frames.
* config/a29k/tm-a29k.h (FRAME_NUM_ARGS):  Update comments.
(DUMMY_FRAME_RSIZE):  Add 2 longwords for PC2 and LR0.
(SETUP_ARBITRARY_FRAME):  Define.