Function arg_attrs_for_rust_scalar 

fn arg_attrs_for_rust_scalar<'tcx>(
    cx: LayoutCx<'tcx>,
    scalar: Scalar,
    layout: TyAndLayout<'tcx>,
    offset: Size,
    is_return: bool,
    determined_fn_def_id: Option<DefId>,
) -> ArgAttributes

Returns argument attributes for a scalar argument.