Moved loop benchmarks to be the default

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

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

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

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

hpvm/test/dnn_benchmarks/benchmarks/mobilenet/mobilenet.cpp

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

...hmarks/benchmarks/resnet50_imagenet/resnet50_imagenet.cpp

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

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

...n_benchmarks/benchmarks/vgg16_imagenet/vgg16_imagenet.cpp