message: Use __muloti4 instead of __rust_i128_mulo
  Fixes
diff: @@ -27,7 +27,8 @@ pub(crate) fn maybe_codegen<'tcx>(
  None
  }
  BinOp::Add | BinOp::Sub if !checked => None,
  - BinOp::Mul if !checked => {
  + BinOp::Mul if !checked || is_signed => {
  + if !checked {
  let val_ty = if is_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 };
  if fx.tcx.sess.target.is_like_windows {
  let ret_place = CPlace::new_stack_slot(fx, lhs.layout());
  @@ -35,8 +36,11 @@ pub(crate) fn maybe_codegen<'tcx>(
  let (rhs_ptr, rhs_extra) = rhs.force_stack(fx);
  assert!(lhs_extra.is_none());
  assert!(rhs_extra.is_none());
  - let args =
  - [ret_place.to_ptr().get_addr(fx), lhs_ptr.get_addr(fx), rhs_ptr.get_addr(fx)];
  + let args = [
  + ret_place.to_ptr().get_addr(fx),
  + lhs_ptr.get_addr(fx),
  + rhs_ptr.get_addr(fx),
  + ];
  fx.lib_call(
  "__multi3",
  vec![
  @@ -51,6 +55,26 @@ pub(crate) fn maybe_codegen<'tcx>(
  } else {
  Some(fx.easy_call("__multi3", &[lhs, rhs], val_ty))
  }
  + } else {
  + let out_ty = fx.tcx.mk_tup([lhs.layout().ty, fx.tcx.types.bool].iter());
  + let oflow = CPlace::new_stack_slot(fx, fx.layout_of(fx.tcx.types.i32));
  + let lhs = lhs.load_scalar(fx);
  + let rhs = rhs.load_scalar(fx);
  + let oflow_ptr = oflow.to_ptr().get_addr(fx);
  + let res = fx.lib_call(
  + "__muloti4",
  + vec![
  + AbiParam::new(types::I128),
  + AbiParam::new(types::I128),
  + AbiParam::new(fx.pointer_type),
  + ],
  + vec![AbiParam::new(types::I128)],
  + &[lhs, rhs, oflow_ptr],
  + )[0];
  + let oflow = oflow.to_cvalue(fx).load_scalar(fx);
  + let oflow = fx.bcx.ins().ireduce(types::I8, oflow);
  + Some(CValue::by_val_pair(res, oflow, fx.layout_of(out_ty)))
  + }
  }
  BinOp::Add | BinOp::Sub | BinOp::Mul => {
  assert!(checked);
  @@ -85,7 +109,6 @@ pub(crate) fn maybe_codegen<'tcx>(
  (BinOp::Sub, false) => "__rust_u128_subo",
  (BinOp::Sub, true) => "__rust_i128_subo",
  (BinOp::Mul, false) => "__rust_u128_mulo",
  - (BinOp::Mul, true) => "__rust_i128_mulo",
  _ => unreachable!(),
  };
  fx.lib_call(name, param_types, vec![], &args);
  