[RFA/dwarf] Anonymous nested function causes SEGV during psymbol read

[Joel Brobecker]

> Joel> +	  /* Ignore subprograms that do not have a name.  Such entries
> Joel> +	     are incorrect, according to the DWARF standard, and we need
> Joel> +	     a function name to create the associated partial symbol.  */
> Joel> +	  if (!pdi->is_declaration && pdi->name)
> Joel>              add_partial_symbol (pdi, cu);
> 
> I think it is worthwhile to call complaint for invalid DWARF.

Thanks again for the feedback.  Attached is a new version of the patch,
with the complaints added.  Since I also added a complaint for the
non-nested case, I also extended the testcase to cover that case as
well.

I will leave the patch out for review for a while, and hopefully commit
sometime next week, if there are no objections.

-- 
Joel
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