[PATCH] Fix ada inferior-data cleanup

[Yao Qi]

On 10/28/2013 07:27 PM, Pedro Alves wrote:
>> 'struct ada_inferior_data' is registered to per-inferior-data with
>> >cleanup ada_inferior_data_cleanup, which means the data will be
>> >destroyed when the inferior exits.
> That's not correct.  The registry data cleanups are only ran when
> the inferior object is destroyed, IOW, when the inferior is
> removed/deleted (e.g, with "remove-inferiors"), not when the program
> exits.
>

Is it a good idea to call clear_inferior_data when inferior exists (in 
exit_inferior_1)?

The comment in registry.h says:

    - clear_TAG_data(TAG, OBJECT)
    Clear all the data associated with OBJECT.  Should be called by the
    container implementation when a container object is destroyed.

It is unclear whether I can use clear_inferior_data in exit_inferior_1. 
  The benefit of this change is that we can remove some attached 
inferior_exit observers.  These inferior_exit observer functions are 
duplicated to inferior_data_cleanup functions.  WDYT?

-- 
Yao (齐尧)