fix fn_cg_attrs

Author: ZuseZ4

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -973,6 +973,5 @@ fn autodiff_attrs(tcx: TyCtxt<'_>, id: DefId) -> Option<AutoDiffAttrs> {
 }
 
 pub(crate) fn provide(providers: &mut Providers) {
-    *providers =
-        Providers { codegen_fn_attrs, should_inherit_track_caller, ..*providers };
+    *providers = Providers { codegen_fn_attrs, should_inherit_track_caller, ..*providers };
 }

compiler/rustc_monomorphize/src/partitioning.rs

@@ -254,20 +254,18 @@ where
             always_export_generics,
         );
 
-        // TODO: This currently crashes compilation:
-        // thread 'rustc' panicked at compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:242:1:
-        // DefId(2:45681 ~ core[1460]::iter::adapters::copied::Copied) does not have a "codegen_fn_attrs"
-        //
         // We can't differentiate something that got inlined.
-        let autodiff_active = cfg!(llvm_enzyme) && {
-            characteristic_def_id
-                .and_then(|def_id| cx.tcx.codegen_fn_attrs(def_id).autodiff_item.as_ref())
-                .is_some_and(|ad| ad.is_active())
-        };
-
-        //if !autodiff_active && visibility == Visibility::Hidden && can_be_internalized {
-        //    internalization_candidates.insert(mono_item);
-        //}
+        let autodiff_active = cfg!(llvm_enzyme)
+            && cx
+                .tcx
+                .codegen_fn_attrs(mono_item.def_id())
+                .autodiff_item
+                .as_ref()
+                .is_some_and(|ad| ad.is_active());
+
+        if !autodiff_active && visibility == Visibility::Hidden && can_be_internalized {
+            internalization_candidates.insert(mono_item);
+        }
         let size_estimate = mono_item.size_estimate(cx.tcx);
 
         cgu.items_mut().insert(mono_item, MonoItemData {
@@ -1275,7 +1273,9 @@ fn collect_and_partition_mono_items(tcx: TyCtxt<'_>, (): ()) -> MonoItemPartitio
                 MonoItem::Fn(ref instance_s) => {
                     let source_id = instance_s.def_id();
                     //if tcx.autodiff_attrs(source_id).is_active() {
-                    if let Some(ad) = &tcx.codegen_fn_attrs(source_id).autodiff_item && ad.is_active() {
+                    if let Some(ad) = &tcx.codegen_fn_attrs(source_id).autodiff_item
+                        && ad.is_active()
+                    {
                         return Some(instance_s);
                     }
                     None