Auto merge of #123537 - compiler-errors:shallow, r=lcnr

Simplify shallow resolver to just fold ty/consts

Probably faster than using a whole folder?

compiler/rustc_trait_selection/src/solve/normalize.rs

@@ -198,7 +198,7 @@ impl<'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for NormalizationFolder<'_, 'tcx> {
     #[instrument(level = "debug", skip(self), ret)]
     fn try_fold_const(&mut self, ct: ty::Const<'tcx>) -> Result<ty::Const<'tcx>, Self::Error> {
         let infcx = self.at.infcx;
-        debug_assert_eq!(ct, infcx.shallow_resolve(ct));
+        debug_assert_eq!(ct, infcx.shallow_resolve_const(ct));
         if !ct.has_aliases() {
             return Ok(ct);
         }