[Bug target/108910] [12/13 Regression] Further ICE in aarch64_layout_arg

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108910

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Christophe Lyon from comment #9)
> So is it expected that the alignment of TYPE_MAIN_VARIANT(type) is 512?

Yes, it is.  aligned attribute on non-aggregate types create a distinct type,
and TYPE_MAIN_VARIANT of a distinct type is the non-qualified variant of such a
distinct type.  For structures/unions, I believe we disallow creation of
less/more aligned variants of the original types, one needs to supply the
alignment when defining the structure/union type.