Add generated function for CUDNN in DFGraph header

hpvm/include/SupportHPVM/DFGraph.h

@@ -401,6 +401,14 @@ public:
       GenFuncs.GPUGenFunc = F;
       GenFuncInfo.gpu_hasCPUFunc = isCPUFunc;
       break;
+    case hpvm::CUDNN_TARGET:
+      if (GenFuncs.GPUGenFunc != NULL) {
+        DEBUG(errs() << "Warning: Second generated GPU function for node "
+                     << FuncPointer->getName() << "\n");
+      }
+      GenFuncs.CUDNNGenFunc = F;
+      GenFuncInfo.cudnn_hasCPUFunc = isCPUFunc;
+      break;
     case hpvm::CPU_OR_GPU_TARGET:
       assert(false && "A node function should be set with a tag specifying its \
                 type, not the node hint itself\n");