message: Fall back to native segment if loading static saved engine fails.
  Instead of SIGSEGV-ing.
diff: @@ -692,6 +692,9 @@ StatusOr<EngineContext*> TRTEngineOp::GetEngine(
  TrtUniquePtrType<nvinfer1::ICudaEngine> static_engine(
  infer->deserializeCudaEngine(serialized_segment_.c_str(),
  serialized_segment_.size(), nullptr));
  + if (!static_engine) {
  + return &empty_context;
  + }
  auto raw_static_engine = static_engine.get();
  const auto max_batch_size = raw_static_engine->getMaxBatchSize();
  // Static engine will have max_batch_size for batch size so that all inputs
  