add todo on struct name generator

Author: varun-r-mallya

pythonbpf/vmlinux_parser/ir_gen/ir_generation.py

@@ -142,6 +142,7 @@ def _struct_name_generator(
         index: int = 0,
         containing_type_size: int = 0,
     ) -> str:
+        # TODO: Does not support Unions as well as recursive pointer and array type naming
         if is_indexed:
             name = (
                 "llvm."