Rollup merge of #111265 - spastorino:has_self-opaque_ty, r=compiler-errors

Make generics_of has_self on RPITITs delegate to the opaque

r? `@compiler-errors`

I couldn't come up with a test case and none of the ones in the `tests` folder is impacted by this change, but I still think is the right thing to do.

Michael, let me know if you have ideas on how to add a test that's affected by this change.

compiler/rustc_ty_utils/src/assoc.rs

@@ -334,7 +334,7 @@ fn associated_type_for_impl_trait_in_trait(
             parent_count,
             params,
             param_def_id_to_index,
-            has_self: false,
+            has_self: opaque_ty_generics.has_self,
             has_late_bound_regions: opaque_ty_generics.has_late_bound_regions,
         }
     });