pushed: [commit/Ada] Ignore __XA types when redundant.

[Joel Brobecker]

> gdb/ChangeLog:
> 
>         * ada-lang.c (ada_is_redundant_range_encoding): New function.
>         (ada_is_redundant_index_type_desc): New function.
>         (to_fixed_array_type): Ignore parallel XA type if redundant.
> 
> gdb/testsuite/ChangeLog:
> 
>         * gdb.ada/arr_arr: New testcase.

Pushed!

Thank you,
-- 
Joel