resolve: Remove item_generics_num_lifetimes

Author: petrochenkov

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -925,10 +925,6 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
         tcx.mk_adt_def(did, adt_kind, variants, repr)
     }
 
-    fn get_generics(self, item_id: DefIndex, sess: &Session) -> ty::Generics {
-        self.root.tables.generics_of.get(self, item_id).unwrap().decode((self, sess))
-    }
-
     fn get_visibility(self, id: DefIndex) -> Visibility<DefId> {
         self.root
             .tables

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -565,10 +565,6 @@ impl CStore {
         self.get_crate_data(def.krate).def_kind(def.index)
     }
 
-    pub fn item_generics_num_lifetimes(&self, def_id: DefId, sess: &Session) -> usize {
-        self.get_crate_data(def_id.krate).get_generics(def_id.index, sess).own_counts().lifetimes
-    }
-
     pub fn module_expansion_untracked(&self, def_id: DefId, sess: &Session) -> ExpnId {
         self.get_crate_data(def_id.krate).module_expansion(def_id.index, sess)
     }

compiler/rustc_resolve/src/lib.rs

@@ -1168,7 +1168,7 @@ impl<'tcx> Resolver<'_, 'tcx> {
         if let Some(def_id) = def_id.as_local() {
             self.item_generics_num_lifetimes[&def_id]
         } else {
-            self.cstore().item_generics_num_lifetimes(def_id, self.tcx.sess)
+            self.tcx.generics_of(def_id).own_counts().lifetimes
         }
     }