[C++ RFC/Patch] PR 58561

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

in this bug we ICE in dwarf2out.c:is_base_type with -g, because it 
doesn't know how to handle the TEMPLATE_TYPE_PARM coming from the C++ 
front-end and representing 'auto' in this kind of C++1y code.

That it shouldn't ICE and return 0 instead I'm pretty sure, I'm less 
sure about the next problem, that is what gen_type_die_with_usage should 
do: build a DW_TAG_unspecified_type, like happens for NULLPTR_TYPE or 
LANG_TYPE?!? Anyway, my wild guessing resulted in adding an hook, per 
the below draft (in any case, tentative names and comments but passes 
testing). Or we want something completely different?

Thanks,
Paolo.

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