Fix the paths to weights, inputs and labels in DNN benchmarks

hpvm/test/dnn_benchmarks/benchmarks/alexnet/alexnet_loop.cpp

hpvm/test/dnn_benchmarks/benchmarks/alexnet2/alexnet2.cpp

...test/dnn_benchmarks/benchmarks/alexnet2/alexnet2_loop.cpp

...nchmarks/benchmarks/alexnet_imagenet/alexnet_imagenet.cpp

...rks/benchmarks/alexnet_imagenet/alexnet_imagenet_loop.cpp

...est/dnn_benchmarks/benchmarks/lenet_mnist/lenet_mnist.cpp

...nn_benchmarks/benchmarks/lenet_mnist/lenet_mnist_loop.cpp

hpvm/test/dnn_benchmarks/benchmarks/resnet18/resnet18.cpp

...test/dnn_benchmarks/benchmarks/resnet18/resnet18_loop.cpp

...dnn_benchmarks/benchmarks/vgg16_cifar10/vgg16_cifar10.cpp

...enchmarks/benchmarks/vgg16_cifar10/vgg16_cifar10_loop.cpp

...n_benchmarks/benchmarks/vgg16_cifar100/vgg16_cifar100.cpp

...chmarks/benchmarks/vgg16_cifar100/vgg16_cifar100_loop.cpp

...chmarks/benchmarks/vgg16_imagenet/vgg16_imagenet_loop.cpp