[llvm] [InstSimplify] Fold (a != 0) ? abs(a) : 0 (PR #70305)

[Philip Reames via llvm-commits]

preames wrote:

This landed with a submission comment which was very out of sync with the approved code.  That's very bad practice, please remember to update the submit comment before pushing the change to main.  

https://github.com/llvm/llvm-project/pull/70305