Varobj cleanups

[Vladimir Prus]

Nick Roberts wrote:

>> > - Volodya
>> > 
>> > Port from Apple's version.
>> > gdb/
>> > * varobj.c (type_changeable): Rename to...
>> > (varobj_value_is_changeable_p): ...this. Adjust all callers.
>> > (is_root_p): New function. Use it everywhere.
>> 
>> OK.
> 
> Is there any reason that this patch has not been committed?

Lack of time on my part. And also the fact that this patch is not very
interesting on itself, it's just a preparation for other patches,
one of which is posted but not reviewed, and others are not finished yet.

- Volodya