Currently, a C struct definition including an alignment hint (ALIGN(64)) cannot be translated to Rust.
Our inability to translate this makes some C ABIs impossible to adhere to, causing crashes and undefined behaviour.
The only way to hack around this is to build prepend your struct with a zero-length array of a SIMD type.
We should have some kind of syntax for this. Perhaps #[align(64)]?
@eddyb proposed #[repr(align(64))], but I fear that complicates the repr attribute a bit much.