[RFA] Reverse Debugging, 1/5

[Joel Brobecker]

> So if we remove the memory of the exec state from the target_ops
> layer and transfer it to the infrun layer, then target_set_execdir
> will have no semantics at all except "does this work".

OK, somehow, I thought things would work differently. Thanks for breaking
through my thick skull. I think that a to_can_... method would indeed
be a good solution.

-- 
Joel