unit test for fc parallelization aot (#50056)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50056
buck test //caffe2/caffe2/contrib/fakelowp/test:test_chunkingnnpi -- --fallback-classic
Test Plan: https://our.intern.facebook.com/intern/testinfra/testrun/7036874446100155
Reviewed By: venkatacrc
Differential Revision: D25731079
fbshipit-source-id: 4aa4ffc641659cd90bf4670d28cb43e43ae76dcd
