Rollup merge of #83040 - lcnr:unused-ct-substs, r=oli-obk

extract `ConstKind::Unevaluated` into a struct

r? `@oli-obk`

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -558,13 +558,11 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                     debug!(?c1, ?c2, "evaluate_predicate_recursively: equating consts");
 
                     let evaluate = |c: &'tcx ty::Const<'tcx>| {
-                        if let ty::ConstKind::Unevaluated(def, substs, promoted) = c.val {
+                        if let ty::ConstKind::Unevaluated(unevaluated) = c.val {
                             self.infcx
                                 .const_eval_resolve(
                                     obligation.param_env,
-                                    def,
-                                    substs,
-                                    promoted,
+                                    unevaluated,
                                     Some(obligation.cause.span),
                                 )
                                 .map(|val| ty::Const::from_value(self.tcx(), val, c.ty))