[llvm] [InstCombine] Drop noundef attributes in `foldCttzCtlz` (PR #116718)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> Generally we should probably stop doing in-place modification where possible, it always only causes issues.

Without in-place modification we may need one-use check. But I think they are likely to have one use in complex patterns.


https://github.com/llvm/llvm-project/pull/116718