[llvm] [DA] Add tests for nsw doesn't hold on entire iteration space (NFC) (PR #162281)

[Sjoerd Meijer via llvm-commits]

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sjoerdmeijer wrote:

A drive-by comment:

There is so much to catch up on for me, and it is also spread over different tickets. Just repeating that I still think a discourse post with one coherent story, all info in one place, would be hugely beneficial. It increases the audience and gives this work more visibility than just the 4 people on this ticket, and we can get more opinions on the different directions.

https://github.com/llvm/llvm-project/pull/162281