add step to create issue (#1530)
Summary:
Creates an issue for regressions in optim userbenchmark.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1530
Reviewed By: xuzhao9
Differential Revision: D44761211
Pulled By: janeyx99
fbshipit-source-id: 4483822708f8c8bd0851824adacfad5eabe60b3e
