[llvm] [InstCombine] Freeze X in fabs(X) op fabs(X) -> X op X to fix undef unsoundness (PR #202217)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I don't want to spend time on fixes to pre-existing multi-use undef issues.

https://github.com/llvm/llvm-project/pull/202217