Replace import cpp_benchmark with `torch.utils.cpp_benchmark` (#38832)
Summary:
Otherwise, I don't understand how those could have been invoked
Also, what is the benefit of importing the same module twice?
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38832
Differential Revision: D21675081
Pulled By: malfet
fbshipit-source-id: fee5604c4c433161b6b1a999d505b5acbbc3b421
