Remove jit from readme and cleanup dependencies. (#1789)
Summary:
We do not support jit in the `test_bench.py` anymore. If anyone needs it, they will be suggested to implement their userbenchmarks for jit benchmarking.
We also want to simplify the user installation so that they don't need to install extra libraries except running the `install.py` script. Therefore, unnecessary package deps are removed from `install.py`.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1789
Reviewed By: msaroufim
Differential Revision: D47834999
Pulled By: xuzhao9
fbshipit-source-id: 7a069e4546679844265d34066b103308900c3a44
