MI: fix base members in references

[Vladimir Prus]

Nick Roberts wrote:

>  >                                                   I guess we need to
>  >                                                   first
>  > commit the primary references patch and then fix c_number_of_children.
>  > Not that I find references to pointers very common thing, but better be
>  > correct.
> 
> The patch below seems to fix it for me.  Its a diff on 1.63 _with_ your
> yet to be committed changes.

I would have preferred if instead of adding if, the code was modified to
look at

        value_type (var->value)

as opposed to

        var->type

The latter is the type of the varobj expression as it is in source program.
The former is the value we're actually showing. It makes sense to use
value_type (var->value) for all presentation purposes.

> 
> Since we have been the only two people directly contributing to for a
> while now MI, and as it would stop the patches piling up, perhaps Vladimir
> (if
> interested) 

I don't very well understand maintainership structure in gdb, but I would
surely appreciate a permission to commit MI patches directly. 

- Volodya