[NNC Testing] Randomized loop nest infrastructure (#70174)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/70174
Test Plan: Imported from OSS
Reviewed By: ZolotukhinM
Differential Revision: D33234529
fbshipit-source-id: 9019f1f1d4ca945c92bee401f7ec674b7d987de4
