[llvm] [InstCombine] Recognize X - 1 as nonnegative when X is positive (PR #223168)

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Fri Sep 25 01:49:45 PDT 2026

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addmisol wrote:

> It seems like all the tests in this PR are now either TODOs or negative tests?

Yeah I changed this PR and added changes in the followup as per the comment above https://github.com/llvm/llvm-project/pull/223168#discussion_r3999295856

https://github.com/llvm/llvm-project/pull/223168

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