[PATCH v4 2/5] elf: Add SFrame stack tracing

[Florian Weimer]

* Claudiu Zissulescu-Ianculescu:

>> Maybe it would be good to force a fallback to the DWARF backtracer,
>> if an object without SFrame information is met.  Except form the
>> initial patch:
>> 
>
> Of course the solution is in front of our eyes .... This may work ...
> what do you think Florian?

I expect that the SFrame unwinder is fast enough that this doesn't have
a performance problem?  Then this approach looks good to me.  But may be
with a comment why we are doing it this way. 8-)

Thanks,
Florian