[llvm] [LoopInterchange] Don't rely on ASSERTS build for tests. NFC. (PR #116780)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

Thanks for the comments, I will follow up soon to:
- fix the `STATS` vs. `CHECK` tag mismatch,
- restore some of the remarks.

I dropped the `cache-line-size` for some tests because I verified it didn't make a difference.

https://github.com/llvm/llvm-project/pull/116780