[llvm] [InstCombine] Fold `cttz(lshr(-1, x) + 1)` to `width - x` (PR #91244)

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Mon May 6 10:48:12 PDT 2024

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goldsteinn wrote:

LGTM. Wait on 1 more.

https://github.com/llvm/llvm-project/pull/91244

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