Simpify varobj children handling for C++

[Vladimir Prus]

Vladimir Prus wrote:

> 
> This patch merges the code for getting name, value and type of
> varobj children for C++ into one function, just like the previously
> posted patch for C.
> 
> This was manually tested from KDevelop. We really need tests
> for MI C++ functionality, and I plan to write them, but only
> after my patch that makes it possible to write MI tests using
> just C files is approved.
> 
> Is this patch OK provided that tests will be writted before committing?

Here's a revised version of this. I've noticed that the new
adjust_value_for_children_access function subsumes get_type_deref,
and therefore this patch removes get_type_deref.

- Volodya

        Refactor getting children name, value and type access 
        for varobjs in C++.
        * value.c (value_as_address): Use coerce_array_proper
        instead of coerce_array so that not fail for references.
        (coerce_array_proper): New function.
        (coerce_array): Use the above.
        * value.h (coerce_array_proper): Declare.
        * valops.c (value_ind): Handle references.
        * varobj.c (get_type_deref): Remove.
        (adjust_value_for_children_access): New.
        (c_number_of_children): Use the above.
        (c_describe_child): Likewise.
        (enum accessibility): New.
        (match_accessibility): New function.
        (cplus_describe_child): New function.
        (cplus_name_of_child, cplus_value_of_child)
        (cplus_type_of_child): Reimplement in terms
        of cplus_describe_child.
        (cplus_number_of_children): Use 
        adjust_value_for_children_access.
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