Add caching for trans_fn_attrs query

Part of #47320

src/librustc/ty/maps/config.rs

@@ -691,3 +691,4 @@ fn try_load_from_disk<'a>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 impl_disk_cacheable_query!(type_of, |def_id| def_id.is_local());
 impl_disk_cacheable_query!(predicates_of, |def_id| def_id.is_local());
 impl_disk_cacheable_query!(used_trait_imports, |def_id| def_id.is_local());
+impl_disk_cacheable_query!(trans_fn_attrs, |_| true);

src/librustc/ty/maps/on_disk_cache.rs

@@ -219,6 +219,7 @@ pub fn serialize<'a, 'tcx, E>(&self,
                 encode_query_results::<const_is_rvalue_promotable_to_static, _>(tcx, enc, qri)?;
                 encode_query_results::<symbol_name, _>(tcx, enc, qri)?;
                 encode_query_results::<check_match, _>(tcx, enc, qri)?;
+                encode_query_results::<trans_fn_attrs, _>(tcx, enc, qri)?;
             }
 
             // Encode diagnostics

src/librustc/ty/maps/plumbing.rs

@@ -998,4 +998,5 @@ pub fn load_from_on_disk_cache(&self, tcx: TyCtxt) {
     GenericsOfItem => generics_of,
     PredicatesOfItem => predicates_of,
     UsedTraitImports => used_trait_imports,
+    TransFnAttrs => trans_fn_attrs,
 );