message: Add deprecation message for lite.OpHint in favor of the new fusion mechanism under
diff: @@ -89,11 +89,18 @@ from tensorflow.python.framework.graph_util_impl import _bfs_for_reachable_nodes
  from tensorflow.python.framework.graph_util_impl import _extract_graph_summary
  from tensorflow.python.ops import array_ops as _array_ops
  from tensorflow.python.util import compat as _compat
  +from tensorflow.python.util import deprecation as _deprecation
  from tensorflow.python.util.all_util import remove_undocumented
  from tensorflow.python.util.tf_export import tf_export as _tf_export
  @_tf_export(v1=["lite.OpHint"])
  +@_deprecation.deprecated(
  + None,
  + "Please follow instructions under "
  + "https://www.tensorflow.org/lite/convert/operation_fusion for operation"
  + "fusion in tflite."
  +)
  class OpHint(object):
  """A class that helps build tflite function invocations.
  @@ -1302,6 +1309,12 @@ def is_ophint_converted(graph_def):
  @_tf_export(v1=["lite.experimental.convert_op_hints_to_stubs"])
  +@_deprecation.deprecated(
  + None,
  + "Please follow instructions under "
  + "https://www.tensorflow.org/lite/convert/operation_fusion for operation"
  + "fusion in tflite."
  +)
  def convert_op_hints_to_stubs(session=None,
  graph_def=None,
  write_callback=lambda graph_def, comments: None):
  