[RFA] alpha frame unwind tweakage

[Mark Kettenis]

Richard Henderson <rth@twiddle.net> writes:

> Two, I was a bit deluded with the hackery surrounding calling
> back into the heuristic unwinder for mdebug frames that were
> still in the prologue.  Mainly, if find_proc_desc can find the
> PDR for a function, so can get_pc_function_start.  And the 
> later works with far more than just mdebug.  This seems to 
> work slightly better when dealing with executables that don't
> contiain debug info, but do have their symbol table.
> 
> Ok?

I'm always in favour of patches that remove code :-), so yes please,
go ahead.  However, could you make the loop incremente patch a
seperate commit?

Mark