message: Process unused status in pipeline op
  Summary: Process and unused status
  Reviewers: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, georgep
  Maniphest Tasks: T36702
diff: @@ -838,8 +838,11 @@ StatusOr<poplar::program::Program> CreatePipelineOp(
  // of the pipeline graph. Provide dummy tensor as won't be used.
  // If not known at compile time we can't create the sequence yet as
  // need to call PropagateDeferredAllocations first
  - visitor->VerifyPipelineArguments(
  - GetGradientAccumulationCountInstruction(inst), poplar::Tensor(), graph);
  + TF_RETURN_IF_ERROR(visitor
  + ->VerifyPipelineArguments(
  + GetGradientAccumulationCountInstruction(inst),
  + poplar::Tensor(), graph)
  + .status());
  }
  auto order = pipeline_computation->parent()
  