[mi] What frame should -data-list-register-values be using?

[Daniel Jacobowitz]

Right now, both -data-list-register-values and -data-list-changed-registers
use deprecated_selected_frame.  This is both wrong and segfault-prone.
The obvious thing to do would be to use get_selected_frame... but take a
look at mi_cmd_data_write_register_values.  Completely undocumented, I might
add.  It uses deprecated_write_register_bytes so it's actually blatting the
_current_ frame.

Thoughts?

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer