[PATCH, PR 46984] Move thunk_delta from cgraph_indirect_call_info to cgraph_edge

[Jan Hubicka]

> I guess that I'd have to add a vector of edges to lto_cgraph_encoder_d
> and to input_cgraph, input_cgraph_opt_summary and its callees.  Hardly
> something to be pre-approved :-)
> 
> I've already written some of this but before I finish it, test it and
> re-post, I'd like to ask you to re-consider.  If we ever build call
> graph edges for calls to thunks (especially as we plan to be able to
> do it when building the graph), such thunk information would become an
> integral part of an edge, without which the edge has an invalid
> meaning.  I'd therefore not consider this an "optimization"
> information in the sense that it is somehow optional (unlike
> args_to_skip or tree_map which we can ignore without miscompiling).
> 
> Or do I somehow misunderstand the intended meaning of the cgraphopt
> section?

Well, cgraphopt stands for cgraph optimization summary that is everything
streamed down from wpa to ltrans but not from lgen to wpa.
I see that we might want to store thunk info on edges to represent the
direct calls to thunks, but this opens another cam of worms since what
is thunk in one unit don't need to be tunk in another. So I think we rather
want to lower the calls...

Honza
> 
> Thanks,
> 
> Martin