re PR ada/39264 (gnat.dg/pack3.adb fails on powerpc64/s390x)
PR ada/39264
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Type>: Do no
call make_packable_type on fat pointer types.
<E_Array_Subtype>: Likewise.
<E_Record_Subtype>: Call make_packable_type on all record types
except for fat pointer types.
(make_packable_type): Likewise.
(gnat_to_gnu_field): Likewise.