message: Fix crash where model_path input to tflite python interpreter segv.
  Fix by holding reference to passed in model_content and relying on
  immutability of PyString (pointer doesn't change).
diff: @@ -54,6 +54,10 @@ class Interpreter(object):
  if not self._interpreter:
  raise ValueError('Failed to open {}'.format(model_path))
  elif model_content and not model_path:
  + # Take a reference, so the pointer remains valid.
  + # Since python strings are immutable then PyString_XX functions
  + # will always return the same pointer.
  + self._model_content = model_content
  self._interpreter = (
  _interpreter_wrapper.InterpreterWrapper_CreateWrapperCPPFromBuffer(
  model_content))
  