[C++ Patch] PR 58980

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

Hi,

in this relatively serious ICE on invalid regression (we don't emit any 
sensible diagnostic before ICE-ing) the problem is that is_ancestor 
simply asserts that the second argument can be only a NAMESPACE_DECL or 
a CLASS_TYPE_P, whereas in the erroneous input at issue it's a 
TYPENAME_TYPE. Thus the idea of not calling is_ancestor at all in this 
case + adjusting the two error_at calls to use %qT instead of %qD 
(dump_type can handle a NAMESPACE_DECL whereas dump_type can't handle a 
TYPENAME_TYPE).

Tested x86_64-linux.

Thanks,
Paolo.

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