Auto merge of #108700 - spastorino:new-rpitit-impl-side-2, r=compiler-errors

Make RPITITs simple cases work when using lower_impl_trait_in_trait_to_assoc_ty

r? `@compiler-errors`

It's probably best reviewed commit by commit.

compiler/rustc_middle/src/query/mod.rs

@@ -1333,6 +1333,7 @@ rustc_queries! {
     /// might want to use `reveal_all()` method to change modes.
     query param_env(def_id: DefId) -> ty::ParamEnv<'tcx> {
         desc { |tcx| "computing normalized predicates of `{}`", tcx.def_path_str(def_id) }
+        feedable
     }
 
     /// Like `param_env`, but returns the `ParamEnv` in `Reveal::All` mode.