message: Fully-qualify function call in TF_CHECK_OK macro implementation, so that it can
  be safely used outside of the tensorflow namespace.
  Note that the StreamExecutor SE_CHECK_OK simply uses TF_CHECK_OK, so this helps
  those cases.
diff: @@ -128,7 +128,7 @@ inline tensorflow::string* TfCheckOpHelper(::tensorflow::Status v,
  }
  #define TF_DO_CHECK_OK(val, level) \
  - while (auto _result = TfCheckOpHelper(val, #val)) \
  + while (auto _result = ::tensorflow::TfCheckOpHelper(val, #val)) \
  LOG(level) << *(_result)
  #define TF_CHECK_OK(val) TF_DO_CHECK_OK(val, FATAL)
  