* arm-tdep.c (arm_skip_prologue): Handle generic dummy frames.

* arm-tdep.c (arm_skip_prologue): Handle generic dummy frames.
(thumb_scan_prologue): Ditto.
(arm_find_callers_reg): Ditto.
(arm_frame_chain): Ditto.
(arm_init_extra_frame_info): Ditto.
(arm_frame_saved_pc): Ditto.
(arm_pop_frame): Ditto.
(arm_push_return_address): New function.
(arm_gdbarch_init): Initialize use_generic_dummy_frames,
call_dummy_location, call_dummy_breakpoint_offset_p,
call_dummy_breakpoint_offset, call_dummy_p,
call_dummy_stack_adjust_p, call_dummy_words,
sizeof_call_dummy_words, call_dummy_start_offset,
call_dummy_length, fix_call_dummy, pc_in_call_dummy,
call_dummy_address, push_return_address and push_dummy_frame for
generic dummy frames.