message: Fix crash when struct argument size is not a multiple of the pointer size
  Fixes
diff: @@ -117,7 +117,9 @@ impl<'tcx> ArgAbiExt<'tcx> for ArgAbi<'tcx, Ty<'tcx>> {
  PassMode::Cast(cast) => cast_target_to_abi_params(cast),
  PassMode::Indirect { attrs, extra_attrs: None, on_stack } => {
  if on_stack {
  - let size = u32::try_from(self.layout.size.bytes()).unwrap();
  + // Abi requires aligning struct size to pointer size
  + let size = self.layout.size.align_to(tcx.data_layout.pointer_align.abi);
  + let size = u32::try_from(size.bytes()).unwrap();
  smallvec![apply_arg_attrs_to_abi_param(
  AbiParam::special(pointer_ty(tcx), ArgumentPurpose::StructArgument(size),),
  attrs
  