message: Make standalone dataset visible internally
  This CL also puts the load statements before the package statement to be consistent with  nearby BUILD files.
diff: +load("//tensorflow:tensorflow.bzl", "tf_cc_test")
  +load("//tensorflow/core/platform:default/build_config.bzl", "tf_protos_all")
  +
  package(
  + default_visibility = [
  + "//tensorflow:internal",
  + ],
  licenses = ["notice"], # Apache 2.0
  )
  -load("//tensorflow:tensorflow.bzl", "tf_cc_test")
  -load("//tensorflow/core/platform:default/build_config.bzl", "tf_protos_all")
  -
  cc_library(
  name = "standalone",
  srcs = ["standalone.cc"],
  