[Bug ada/28115] Support packed array encoded as DW_TAG_subrange_type

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28115

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Hmm, this recent gcc commit looks interesting:
...
commit c0b03afeab4502da3040ef1ebbd28f826737fa8a
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Mon Sep 6 11:16:08 2021 +0200

    Fix debug info for packed array types in Ada

    Packed array types are sometimes represented with integer types under the
    hood in Ada, but we nevertheless need to emit them as array types in the
    debug info so we have the types.get_array_descr_info langhook for this
    purpose; but it is not invoked from modified_type_die, which causes:

    FAIL: gdb.ada/arrayptr.exp: scenario=minimal: print pa_ptr.all
    FAIL: gdb.ada/arrayptr.exp: scenario=minimal: print pa_ptr.all(3)

    in the GDB testsuite.

    gcc/
            * dwarf2out.c (modified_type_die): Deal with all array types
earlier
            and use local variable consistently throughout the function.
...

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