Added predictive tuner

llvm/projects/pred_tuner/models/torch/shufflenet.py

llvm/projects/pred_tuner/models/torch/shufflenetv2.py

llvm/projects/pred_tuner/models/torch/vgg.py

llvm/projects/pred_tuner/run_tuner.py

llvm/projects/pred_tuner/tests/data/1_1_output.json

llvm/projects/pred_tuner/tests/data/3_3_output.json

llvm/projects/pred_tuner/tests/data/promise.json

llvm/projects/pred_tuner/tests/data/quantization.json

llvm/projects/pred_tuner/tests/promise.py

llvm/projects/pred_tuner/tests/resnet50.py

llvm/projects/pred_tuner/tests/sampling.py

llvm/projects/pred_tuner/toolkit/__init__.py

llvm/projects/pred_tuner/toolkit/approxdnn.py

llvm/projects/pred_tuner/toolkit/estimators.py

llvm/projects/pred_tuner/toolkit/indexing.py

llvm/projects/pred_tuner/toolkit/transform.py

llvm/projects/pred_tuner/utils/__init__.py

llvm/projects/pred_tuner/utils/benchmarks.json

llvm/projects/pred_tuner/utils/config.py

llvm/projects/pred_tuner/utils/logging.py