message: inliner: Use substs_for_mir_body
  Changes from 68965 extended the kind of instances that are being
  inlined. For some of those, the `instance_mir` returns a MIR body that
  is already expressed in terms of the types found in substitution array,
  and doesn't need further substitution.
  Use `substs_for_mir_body` to take that into account.
diff: @@ -361,13 +361,11 @@ pub(crate) fn monomorphize<T>(&self, value: &T) -> T
  where
  T: TypeFoldable<'tcx> + Copy,
  {
  - if let Some(substs) = self.instance.substs_for_mir_body() {
  - self.tcx
  - .subst_and_normalize_erasing_regions(substs, ty::ParamEnv::reveal_all(), value)
  - } else {
  - self.tcx
  - .normalize_erasing_regions(ty::ParamEnv::reveal_all(), *value)
  - }
  + self.instance.subst_mir_and_normalize_erasing_regions(
  + self.tcx,
  + ty::ParamEnv::reveal_all(),
  + value
  + )
  }
  pub(crate) fn clif_type(&self, ty: Ty<'tcx>) -> Option<Type> {
  