[Bug ada/63725] Scalar_Storage_Order and nested string subtypes

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63725

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> That seems to work, but in a non trivial case doesn't that make string_type
> non inter operable with other string types?

Interoperability should be preserved modulo minor adjustments.