Rollup merge of #105400 - BoxyUwU:braced_param_evaluatability, r=oli-obk

normalize before handling simple checks for evaluatability of `ty::Const`

`{{{{{{{ N }}}}}}}` is desugared into a `ConstKind::Unevaluated` for an anonymous `const` item so when calling `is_const_evaluatable` on it we skip the `ConstKind::Param(_) => Ok(())` arm which is incorrect.

compiler/rustc_trait_selection/src/traits/const_evaluatable.rs

@@ -30,7 +30,7 @@ pub fn is_const_evaluatable<'tcx>(
     span: Span,
 ) -> Result<(), NotConstEvaluatable> {
     let tcx = infcx.tcx;
-    match unexpanded_ct.kind() {
+    match tcx.expand_abstract_consts(unexpanded_ct).kind() {
         ty::ConstKind::Unevaluated(_) | ty::ConstKind::Expr(_) => (),
         ty::ConstKind::Param(_)
         | ty::ConstKind::Bound(_, _)