message: Whitelist functools.lru_cache for AutoGraph pass-through.
diff: @@ -246,6 +246,10 @@ def converted_call(f, owner, options, args, kwargs):
  logging.log(2, 'Permanently whitelisted: %s: wrapt decorated', f)
  return _call_unconverted(f, args, kwargs)
  + if _is_known_loaded_type(f, 'functools', '_lru_cache_wrapper'):
  + logging.log(2, 'Permanently whitelisted: %s: lru_cache', f)
  + return _call_unconverted(f, args, kwargs)
  +
  # Constructors are permanently whitelisted.
  # TODO(mdan): Toggle as experimental feature instead.
  # TODO(b/124016764): Remove this limitation.
  