[Ada] "ptype" of array where bound value uses DW_OP_push_object_address

[Ada] "ptype" of array where bound value uses DW_OP_push_object_address

Consider an Ada array type where the DWARF debugging info for
at least one of the bounds involves an expression containing
a DW_OP_push_object_address operation. Trying to "ptype" that
type currently yields:

    (gdb) ptype foo.array_type
    type = array (Location address is not set.

This patch improves ada-typeprint by adding handling of the situation
where an array range type has dynamic bounds.  In that case, it prints
the array bounds using Ada's typical syntax for unbounded ranges "<>":

    (gdb) ptype array_type
    type = array (<>) of integer

gdb/ChangeLog:

        * ada-typeprint.c (type_is_full_subrange_of_target_type):
        Return 0 if TYPE is dynamic.
        (print_range): Add handling of dynamic ranges.