Update torchdynamo backend for torchbench (#1091)
Summary:
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1091
Previously not added to TARGETS build file, so trying to run internally would fail when `--dynamo` is added to torchbench command
Also removed aot_autograd_speedup_strategy to reflect changes in https://github.com/pytorch/torchdynamo/pull/201 (i.e. use `--torchdynamo aot_nvfuser` instead)
Reviewed By: xuzhao9
Differential Revision: D38445665
fbshipit-source-id: 013bdf5603da6e211936f354a1fccc5dccea1103
