[llvm] [SelectionDAG] Fix and improve TargetLowering::SimplifySetCC (PR #87646)

[Björn Pettersson via llvm-commits]

bjope wrote:

> For the record, the arm regression is code correct codegen, right?

Could you be more specific about which diff you are talking about.

https://github.com/llvm/llvm-project/pull/87646