Function fn_abi_adjust_for_abi

fn fn_abi_adjust_for_abi<'tcx>(
    cx: &LayoutCx<'tcx>,
    fn_abi: &mut FnAbi<'tcx, Ty<'tcx>>,
    abi: ExternAbi,
    fn_def_id: Option<DefId>,
) -> Result<(), &'tcx FnAbiError<'tcx>>