Create the new pytorch nightly userbenchmark for V3 (#1482)
Summary: Pull Request resolved: https://github.com/pytorch/benchmark/pull/1482
Test Plan:
```
python run_benchmark.py torch-nightly -d cuda -t train,eval
```
Reviewed By: weiwangmeta
Differential Revision: D44033592
Pulled By: xuzhao9
fbshipit-source-id: e87c23f0a4f2f60bd8e04a2d28095f2e3a4be0e7
