Removing unused dirs from hpvm-tensor-rt

hpvm/projects/hpvm-tensor-rt/PPoPP_results/knobs.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_120.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_151.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_152.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_153.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_154.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_155.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_156.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_157.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_158.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_159.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_160.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_161.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_162.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_163.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_164.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_165.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_166.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_167.txt

.../alexnet2_cifar10/alexnet2_cifar10_fp16_perf_fp16_168.txt