Fix PR debug/45088

[Jason Merrill]

On 12/14/2010 01:26 PM, Dodji Seketeli wrote:
> +  if (is_injected_class_name (TYPE_NAME (type)))
> +    type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));

Yes, that should do the trick, but I might still tweak it a bit.

The problematic case is when is_redundant_typedef (decl) && 
DECL_ORIGINAL_TYPE (decl) are both true; gen_decl_die assumes that these 
two conditions can't occur together, which is why things break.  This 
change will make that assumption valid again, but I'd feel better about 
using that condition directly (that is, if (is_redundant_typedef 
(TYPE_NAME (type)) && DECL_ORIGINAL_TYPE (TYPE_NAME (type))) rather than 
assuming that the injected-class-name is the only redundant typedef for 
which this can happen.

I think we should also add an explicit assert to gen_decl_die in the 
is_redundant_typedef case to make sure that DECL_ORIGINAL_TYPE is NULL_TREE.

Jason