[Bug target/125838] aarch64: Implementation divergence in vendor::preserve_none with variadic calls.

[alfierichards at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125838

--- Comment #16 from Alfie Richards <alfierichards at gcc dot gnu.org> ---
:)

I imagine preserve_none's use case is pretty much orthogonal to variadic args
use case. 

So I don't think it's worth trying to get Clang to change their behavior even
if I marginally prefer ours/it may have slight performance benefits. 

I think the best option is to change our behavior to match theirs and fall back
to AAPCS when using variadic args.