resolve: Remove CStore::def_kind

Author: petrochenkov

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

@@ -529,10 +529,6 @@ impl CStore {
         )
     }
 
-    pub fn def_kind(&self, def: DefId) -> DefKind {
-        self.get_crate_data(def.krate).def_kind(def.index)
-    }
-
     /// Only public-facing way to traverse all the definitions in a non-local crate.
     /// Critically useful for this third-party project: <https://github.com/hacspec/hacspec>.
     /// See <https://github.com/rust-lang/rust/pull/85889> for context.

compiler/rustc_resolve/src/build_reduced_graph.rs

@@ -114,7 +114,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         }
 
         if !def_id.is_local() {
-            let def_kind = self.cstore().def_kind(def_id);
+            let def_kind = self.tcx.def_kind(def_id);
             if let DefKind::Mod | DefKind::Enum | DefKind::Trait = def_kind {
                 let parent = self
                     .tcx