message: Changes backend config setting for outlined instruction call from Call to Function
  Summary: FIX T65996
  Reviewers: georgep, alfiee, #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved
  Maniphest Tasks: T65996
diff: @@ -104,7 +104,7 @@ Status MoveInstructionIntoCacheableComputation(HloInstruction* inst) {
  TF_ASSIGN_OR_RETURN(auto poplar_backend_config,
  inst->backend_config<PoplarBackendConfig>());
  auto* call_config = poplar_backend_config.mutable_call_config();
  - call_config->set_type(PoplarBackendConfig::CallConfig::Call);
  + call_config->set_type(PoplarBackendConfig::CallConfig::Function);
  poplar_backend_config.clear_ml_type();
  TF_RETURN_IF_ERROR(call->set_backend_config(poplar_backend_config));
  