message: Expose tf_if_stmt to other modules.
diff: @@ -212,12 +212,12 @@ def if_stmt(cond, body, orelse):
  Tuple containing the statement outputs.
  """
  if tensor_util.is_tensor(cond):
  - return _tf_if_stmt(cond, body, orelse)
  + return tf_if_stmt(cond, body, orelse)
  else:
  return _py_if_stmt(cond, body, orelse)
  -def _tf_if_stmt(cond, body, orelse):
  +def tf_if_stmt(cond, body, orelse):
  """Overload of if_stmt that stages a TF cond."""
  return control_flow_ops.cond(cond, body, orelse)
  