[PATCH] [GVN] Set proper debug locations for some instructions created by GVN.

[Daniel Berlin]

>
>> Do you think it's fine to proceed with the given patch, or we'd better do
>> something different?
>
> No, i think you should proceed with this one.

Sorry, i meant "i think you should proceed with this patch, not do
something different".

> I don't think it's worth trying to do something better here ATM,
> because it seems really hard to come up with an answer that is
> "strictly better" and not just "different" :)