[PATCH 3/5] Add frame pointer unwinding as fallback on x86_64

[Ulf Hermann]

On 04/25/2017 02:49 PM, Mark Wielaard wrote:
> From: Ulf Hermann <ulf.hermann@qt.io>
> 
> If we don't find any debug information for a given frame, we usually
> cannot unwind any further. However, the binary in question might have
> been compiled with frame pointers, in which case we can look up the
> well known frame pointer locations in the stack snapshot and use them
> to bridge the frames without debug information.
> 
> The "unwind" hook is the right place for this as it is so far only
> used on s390 and called only after trying to unwind with debug
> information.

Looks good to me.
Ulf