deprecated_selected_frame

[Andrew Cagney]

> Hi Andrew,
> 
> Do you know of any places where converting to get_selected_frame () is
> really wrong?

Most of the code should gain a frame parameter and receive the selected 
frame that way.  Only the top level MI/CLI code, where the `selected 
thread's selected frame' has meaning should get_selected_frame be used.

> A very few of the == NULL checks should probably stay for
> now, but I bet that all of the uses shouldn't.

> I've got two independent bug reports caused by a NULL
> deprecated_selected_frame on the 6.0 branch, and I fixed one last week.

The last one I saw was a top level MI routine so get_selected_frame 
would make sense.

Andrew