sls + layernorm test (#43799)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/43799
Test Plan: https://www.internalfb.com/intern/testinfra/testconsole/testrun/3096224784866350/
Reviewed By: venkatacrc
Differential Revision: D23383351
fbshipit-source-id: c312d481ad15bded83bea90beaaae7742d0c54b8
