Rollup merge of #128494 - RalfJung:mir-lazy-lists, r=compiler-errors

MIR required_consts, mentioned_items: ensure we do not forget to fill these lists

Bodies initially get created with empty required_consts and mentioned_items, but at some point those should be filled. Make sure we notice when that is forgotten.

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -877,7 +877,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         body: &'tcx mir::Body<'tcx>,
     ) -> InterpResult<'tcx> {
         // Make sure all the constants required by this frame evaluate successfully (post-monomorphization check).
-        for &const_ in &body.required_consts {
+        for &const_ in body.required_consts() {
             let c =
                 self.instantiate_from_current_frame_and_normalize_erasing_regions(const_.const_)?;
             c.eval(*self.tcx, self.param_env, const_.span).map_err(|err| {