message: Fix broken open source build.
diff: @@ -422,7 +422,7 @@ StatusOr<ComputationDataHandle> UserComputation::AddMapInstruction(
  TF_ASSIGN_OR_RETURN(
  Shape inferred_shape,
  ShapeInference::InferMapShape(operand_shapes, *to_apply_program_shape,
  - map_request.dimensions()));
  + AsInt64Slice(map_request.dimensions())));
  ComputationDataHandle handle = CreateComputationDataHandle();
  