Support native member 'used' for frozenset

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/capi/DynamicObjectNativeWrapper.java

@@ -129,7 +129,7 @@
 import com.oracle.graal.python.builtins.objects.module.PythonModule;
 import com.oracle.graal.python.builtins.objects.object.PythonObject;
 import com.oracle.graal.python.builtins.objects.property.PProperty;
-import com.oracle.graal.python.builtins.objects.set.PSet;
+import com.oracle.graal.python.builtins.objects.set.PBaseSet;
 import com.oracle.graal.python.builtins.objects.slice.PSlice;
 import com.oracle.graal.python.builtins.objects.str.PString;
 import com.oracle.graal.python.builtins.objects.str.StringNodes.StringLenNode;
@@ -1059,7 +1059,7 @@ static Object doDQualname(PythonObject object, @SuppressWarnings("unused") Pytho
         }
 
         @Specialization(guards = "eq(SET_USED, key)", limit = "1")
-        static long doSetUsed(PSet object, @SuppressWarnings("unused") PythonNativeWrapper nativeWrapper, @SuppressWarnings("unused") String key,
+        static long doSetUsed(PBaseSet object, @SuppressWarnings("unused") PythonNativeWrapper nativeWrapper, @SuppressWarnings("unused") String key,
                         @CachedLibrary("object.getDictStorage()") HashingStorageLibrary lib) {
             return lib.length(object.getDictStorage());
         }