do not remove conv node just rewire the output

paddle/fluid/framework/ir/conv_relu_mkldnn_fuse_pass.cc

@@ -50,28 +50,13 @@ std::unique_ptr<ir::Graph> ConvReLUFusePass::ApplyImpl(
     GET_IR_NODE_FROM_SUBGRAPH(relu, relu, conv_relu_pattern);  // ReLU op
 
     // Create an ConvReLU Node.
-    OpDesc desc;
-    std::string conv_relu_i_in = subgraph.at(conv_input)->Name();
-    std::string conv_relu_w_in = conv_weight->Name();
-    std::string conv_relu_b_in = conv_bias->Name();
-    std::string conv_relu_out = relu_out->Name();
-    desc.SetInput("Input", std::vector<std::string>({conv_relu_i_in}));
-    desc.SetInput("Filter", std::vector<std::string>({conv_relu_w_in}));
-    desc.SetInput("Bias", std::vector<std::string>({conv_relu_b_in}));
-    desc.SetOutput("Output", std::vector<std::string>({conv_relu_out}));
-    desc.SetType("conv2d");
-    for (auto& attr : conv->Op()->GetAttrMap()) {
-      desc.SetAttr(attr.first, attr.second);
-    }
-    desc.SetAttr("fuse_relu", true);
-    auto conv_relu_node = g->CreateOpNode(&desc);  // OpDesc will be copied.
-    GraphSafeRemoveNodes(graph.get(), {conv, relu, conv_out});
+    OpDesc* desc = conv->Op();
+    desc->SetOutput("Output", std::vector<std::string>({relu_out->Name()}));
+    desc->SetAttr("fuse_relu", true);
+    GraphSafeRemoveNodes(graph.get(), {relu, conv_out});
 
     PADDLE_ENFORCE(subgraph.count(conv_input));
-    IR_NODE_LINK_TO(subgraph.at(conv_input), conv_relu_node);
-    IR_NODE_LINK_TO(conv_weight, conv_relu_node);
-    IR_NODE_LINK_TO(conv_bias, conv_relu_node);
-    IR_NODE_LINK_TO(conv_relu_node, relu_out);
+    IR_NODE_LINK_TO(conv, relu_out);
 
     found_conv_relu_count++;
   };