lto gimple types and debug info

[Chris Lattner]

On Jul 25, 2008, at 9:20 AM, Michael Matz wrote:
>> That is one example of extremely important information which requires
>> pulling in almost the entire source type system.
>
> But not all the trees implementing those types (and all the
> cross-references between those, that are important for parsing but not
> interesting at all for the middle-end).  All you need is a tag  
> (alias set
> number) per type and a graph giving the conflicts between those tags.

With that level of information, how do you "link" the alias trees for  
different modules at LTO time?

-Chris