Rollup merge of rust-lang#105472 - spastorino:make-encoder-use-queries, r=oli-obk

Make encode_info_for_trait_item use queries instead of accessing the HIR

This change avoids accessing the HIR on `encode_info_for_trait_item` and uses queries. We will need to execute this function for elements that have no HIR and by using queries we will be able to feed for definitions that have no HIR.

r? ``@oli-obk``

Author: matthiaskrgr

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1337,24 +1337,16 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         debug!("EncodeContext::encode_info_for_trait_item({:?})", def_id);
         let tcx = self.tcx;
 
-        let ast_item = tcx.hir().expect_trait_item(def_id.expect_local());
-        self.tables.impl_defaultness.set(def_id.index, ast_item.defaultness);
+        let impl_defaultness = tcx.impl_defaultness(def_id.expect_local());
+        self.tables.impl_defaultness.set(def_id.index, impl_defaultness);
         let trait_item = tcx.associated_item(def_id);
         self.tables.assoc_container.set(def_id.index, trait_item.container);
 
         match trait_item.kind {
             ty::AssocKind::Const => {}
             ty::AssocKind::Fn => {
-                let hir::TraitItemKind::Fn(m_sig, m) = &ast_item.kind else { bug!() };
-                match *m {
-                    hir::TraitFn::Required(ref names) => {
-                        record_array!(self.tables.fn_arg_names[def_id] <- *names)
-                    }
-                    hir::TraitFn::Provided(body) => {
-                        record_array!(self.tables.fn_arg_names[def_id] <- self.tcx.hir().body_param_names(body))
-                    }
-                };
-                self.tables.asyncness.set(def_id.index, m_sig.header.asyncness);
+                record_array!(self.tables.fn_arg_names[def_id] <- tcx.fn_arg_names(def_id));
+                self.tables.asyncness.set(def_id.index, tcx.asyncness(def_id));
                 self.tables.constness.set(def_id.index, hir::Constness::NotConst);
             }
             ty::AssocKind::Type => {