fixup! Use a C-safe return type for __rust_[ui]128_* overflowing intrinsics

Author: tgross35

compiler/rustc_codegen_cranelift/src/codegen_i128.rs

@@ -98,6 +98,7 @@ pub(crate) fn maybe_codegen_checked<'tcx>(
             );
             let mul = ret[0];
             let oflow = oflow_out_place.to_cvalue(fx).load_scalar(fx);
+            let oflow = clif_intcast(fx, oflow, types::I8, false);
             let layout = fx.layout_of(Ty::new_tup(fx.tcx, &[lhs.layout().ty, fx.tcx.types.bool]));
             Some(CValue::by_val_pair(mul, oflow, layout))
         }