[llvm] [LoopInterchange] Precommit tests for scalar dependencies. NFC. (PR #115900)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

I am going ahead with pre-committing these tests which I think is fine. Next, I am going to look into addressing the functional issue (#54176), so we can discuss things further when I put something up for review.

https://github.com/llvm/llvm-project/pull/115900