message: replaced std with absl
diff: @@ -12,6 +12,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  +#include "absl/base/call_once.h"
  #include "tensorflow/core/common_runtime/threadpool_device.h"
  @@ -41,7 +42,7 @@ limitations under the License.
  #endif
  namespace tensorflow {
  -std::once_flag omp_setting_flag;
  +absl::once_flag omp_setting_flag;
  ThreadPoolDevice::ThreadPoolDevice(const SessionOptions& options,
  const string& name, Bytes memory_limit,
  @@ -61,7 +62,7 @@ ThreadPoolDevice::ThreadPoolDevice(const SessionOptions& options,
  // Default to available physical cores
  const int mkl_intra_op = port::NumSchedulableCPUs();
  const int ht = port::NumHyperthreadsPerCore();
  - std::call_once(omp_setting_flag, omp_set_num_threads,
  + absl::call_once(omp_setting_flag, omp_set_num_threads,
  (mkl_intra_op + ht - 1) / ht);
  }
  #endif // _OPENMP
  