Change VISC to HPVM in DNN benchmarks

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

...st/dnn_benchmarks/benchmarks/alexnet/src/alexnet_loop.cpp

.../test/dnn_benchmarks/benchmarks/alexnet2/src/alexnet2.cpp

.../dnn_benchmarks/benchmarks/alexnet2/src/alexnet2_loop.cpp

...dnn_benchmarks/benchmarks/lenet_mnist/src/lenet_mnist.cpp

...enchmarks/benchmarks/lenet_mnist/src/lenet_mnist_loop.cpp

...est/dnn_benchmarks/benchmarks/mobilenet/src/mobilenet.cpp

...nn_benchmarks/benchmarks/mobilenet/src/mobilenet_loop.cpp

.../test/dnn_benchmarks/benchmarks/resnet18/src/resnet18.cpp

.../dnn_benchmarks/benchmarks/resnet18/src/resnet18_loop.cpp

...ks/benchmarks/resnet50_imagenet/src/resnet50_imagenet.cpp

...nchmarks/resnet50_imagenet/src/resnet50_imagenet_loop.cpp

...benchmarks/benchmarks/vgg16_cifar10/src/vgg16_cifar10.cpp

...marks/benchmarks/vgg16_cifar10/src/vgg16_cifar10_loop.cpp

...nchmarks/benchmarks/vgg16_cifar100/src/vgg16_cifar100.cpp

...rks/benchmarks/vgg16_cifar100/src/vgg16_cifar100_loop.cpp

...nchmarks/benchmarks/vgg16_imagenet/src/vgg16_imagenet.cpp

...rks/benchmarks/vgg16_imagenet/src/vgg16_imagenet_loop.cpp