Load instance setup script before running benchmark (#1217)
Summary:
Fixes the broken bisection workflows after machine OS upgrade.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1217
Test Plan:
GitHub actions workflow
https://github.com/pytorch/benchmark/actions/runs/3147474083/jobs/5117012874
Reviewed By: atalman
Differential Revision: D39941935
Pulled By: atalman
fbshipit-source-id: 13daa28b9f801a4e163484e49e67a09cad25d52b
