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Re: Aliasing brokenness (Was: Re: [patch RFC] SH:Use FRAME_GROWS_DOWNWARD)

> While typex immediately becomes __builtin_va_list, typey never does.  
> The logic in
> nonoverlapping_component_refs_p might have been good enough to find a lot of
> common types, but it is not good enough to find all of them.

I'm confused.
It looks like one type is a builtin_va_list and one type is a va_list,
which don't seem to share anything in common.
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