[llvm] [LoopInterchange] Make the entries of the Dependency Matrix unique (PR #116195)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

Now the print function is guarded by NDEBUG instead, I believe you can add a test now. Please remember to add `REQUIRES: asserts` to the test.

https://github.com/llvm/llvm-project/pull/116195