Function create_zst

crates/rustc_codegen_spirv/src/abi.rs:601–611

(cx: &CodegenCx<'tcx>, span: Span, ty: TyAndLayout<'tcx>)

// the type is really more "Layout with Ty" (`.ty` field + `Deref`s to `Layout`).
fn trans_aggregate<'tcx>(cx: &CodegenCx<'tcx>, span: Span, ty: TyAndLayout<'tcx>) -> Word {
    fn create_zst<'tcx>(cx: &CodegenCx<'tcx>, span: Span, ty: TyAndLayout<'tcx>) -> Word {
        SpirvType::Adt {
            def_id: def_id_for_spirv_type_adt(ty),
            size: Some(Size::ZERO),
            align: Align::from_bytes(0).unwrap(),
            field_types: &[],
            field_offsets: &[],
            field_names: None,
        }
        .def_with_name(cx, span, TyLayoutNameKey::from(ty))
    }
    match ty.fields {
        FieldsShape::Primitive => span_bug!(
            span,