Adding bc utility used by memory monitoring (#1342)
Summary:
Currently the workflow https://github.com/pytorch/benchmark/actions/runs/3681183252 shows bc: command not found and the memory reporting shows 0.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1342
Reviewed By: xuzhao9
Differential Revision: D42013845
Pulled By: weiwangmeta
fbshipit-source-id: 7a2b1f0bc57ab649418c0b775995340a9a8ac56a
