message: Fix vlog of non-functions (e.g. callable objects).
diff: @@ -1091,7 +1091,7 @@ class PolymorphicFunction(object):
  if graph_function is None:
  logging.vlog(1,
  "Creating new FuncGraph for Python function %r (key: %r)",
  - self._python_function.__name__, cache_key)
  + self._python_function, cache_key)
  if self._input_signature is None:
  arglen = len(args)
  else:
  