[RFA] Add new language: "unsupported"

[Joel Brobecker]

>  > It should probably warn (I guess it has to be in the reader, since we 
>  > have no hook for when you switch to a language, right?) when it is 
>  > switching to the unsupported language.
>  > 
>  > Something like "Warning: The current language is unsupported by GDB. 
>  > Name lookups and printouts may not look like what you expect as a 
>  > result".
> 
> that's not a bad idea, actually. This must be the lawyer talking :-)

I can place a warning in set_language(). But I think the warning should
only be printed once. Opinions? 

I'm also wondering how useful such a warning is going to be. I think
that the new language name, "minimal", is pretty clear as to what
capabilities it provides (or doesn't thereof)... Since GDB clearly
prints the new language name when auto-switching, I don't think there is
any risk of confusion anymore.

-- 
Joel