[rfc][21/37] Eliminate builtin_type_ macros: Platform-neutral builtin_type_void

[Joel Brobecker]

> > I don't want to add a field in our type structure to mark the types
> > that are architecture-specific, since that would have a noticeable
> > memory cost just for a few specific types.
> 
> No, it wouldn't.  We have tons of free flag bits; it sounds like the
> right thing to do would be to mark only the global types.> 

Duh!!! Of course...

-- 
Joel