[C++ Patch] Three additional bitfield diagnostic tweaks (a regression fix included)

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

Hi,

I'm bundling together 3 more. In attachment order:

1- Since we decided to explicitly print the wrong type, I suppose we 
want to consistently do that in templates too.

2- Unfortunately I have to fix another buglet I recently introduced, 
completely similar to c++/88222 fixed by Marek. Well, at least we will 
not print anymore an empty '' when the unqualified_id is null because 
the field is unnamed.

3- In the non-static case too, when from grokdeclarator we are calling 
FIELD_DECL and passing the location as first argument, I think we want 
to likewise pass declarator->id_loc when available.

The added/extended testcase exercise all of the above. Tested x86_64-linux.

Thanks, Paolo.

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