message: Add missing using statement.
  These functions are in global namespace and so need using statement for int64
  type.
diff: @@ -37,6 +37,8 @@ limitations under the License.
  #include "tensorflow/compiler/xla/status_macros.h"
  #include "tensorflow/compiler/xla/xla_data.pb.h"
  +using tensorflow::int64;
  +
  static std::vector<int64> ConvertDenseIntAttr(mlir::DenseIntElementsAttr attr) {
  llvm::ArrayRef<int64> raw_data = attr.getValues<int64>();
  if (attr.isSplat())
  