!8036 BnAddReluGrad fusion check

Merge pull request !8036 from chenweifeng/BnAddReluGrad-check

mindspore/ccsrc/backend/optimizer/gpu/batch_norm_add_relu_grad_fusion.cc

@@ -140,6 +140,9 @@ const AnfNodePtr BatchNormAddReluGradFusion::Process(const FuncGraphPtr &graph,
   // process pattern as Relu(TensorAdd(BN#0, BN#1))
   auto tuple_getitem = AnfAlgo::GetInputNode(utils::cast<CNodePtr>(node), 5);
   MS_EXCEPTION_IF_NULL(tuple_getitem);
+  if (!utils::isa<CNodePtr>(tuple_getitem) || AnfAlgo::GetCNodeName(tuple_getitem) != prim::kPrimTupleGetItem->name()) {
+    return nullptr;
+  }
   auto forward_node = AnfAlgo::GetInputNode(utils::cast<CNodePtr>(tuple_getitem), 0);
   if (AnfAlgo::GetCNodeName(forward_node) != kFusedBatchNormExWithAddAndActivation) {
     return nullptr;