add disclaimer for leaks in codegen_deferred_annotations_body

Author: A0su

Python/codegen.c

@@ -798,6 +798,9 @@ codegen_deferred_annotations_body(compiler *c, location loc,
         if (!mangled) {
             return ERROR;
         }
+        // NOTE: ref of mangled can be leaked on ADDOP* and VISIT macros due to early returns
+        // fixing would require an overhaul of these macros 
+
         PyObject *cond_index = PyList_GET_ITEM(conditional_annotation_indices, i);
         assert(PyLong_CheckExact(cond_index));
         long idx = PyLong_AS_LONG(cond_index);