[llvm] [SelectionDAG] Fix missed optimization for CLMUL where one operand is all ones (PR #200592)

[Jan Schultke via llvm-commits]

eisenwave wrote:

Ok well, I'm out of ideas. I've rebased on the latest `main` and regenerated fresh test expectations from scratch with `llc` and it still won't build. 

https://github.com/llvm/llvm-project/pull/200592