Adjust Conv+bias to placement pass

test=develop

paddle/fluid/framework/ir/conv_bias_mkldnn_fuse_pass.cc

@@ -71,6 +71,13 @@ std::unique_ptr<ir::Graph> ConvBiasFusePass::ApplyImpl(
 
     PADDLE_ENFORCE(subgraph.count(conv_input));
 
+    // check if fuse can be done and if MKL-DNN should be used
+    FuseOptions fuse_option = FindFuseOption(*conv, *eltwise);
+    if (fuse_option == DO_NOT_FUSE || fuse_option == FUSE_NATIVE) {
+      VLOG(3) << "do not perform conv+bias fuse";
+      return;
+    }
+
     auto* eltwise_bias_tensor =
         scope->FindVar(eltwise_bias->Name())->GetMutable<LoDTensor>();