enable TensorScatterUpdateFission pass in pynative mode

mindspore/ccsrc/pre_activate/ascend/ascend_backend_optimization.cc

@@ -292,6 +292,7 @@ void RunOpAscendBackendIRFusionOptimization(const std::shared_ptr<session::Kerne
   ir_fusion_pm->AddPass(std::make_shared<TopKSplit>());
   ir_fusion_pm->AddPass(std::make_shared<AddnFission>());
   ir_fusion_pm->AddPass(std::make_shared<InsertPadForNMSWithMask>());
+  ir_fusion_pm->AddPass(std::make_shared<TensorScatterUpdateFission>());
 
   optimizer->AddPassManager(ir_fusion_pm);
   (void)optimizer->Optimize(kernel_graph);