[llvm] [Passes] Run SimpleLoopUnswitch after introducing invariant branches. (PR #81271)

[Nikita Popov via llvm-commits]

nikic wrote:

In the interest of not making perfect the enemy of good, I'd be happy to go forward with your current approach.

Could you please resolve the comments regarding extra comments and check whether this patch fixes https://github.com/llvm/llvm-project/issues/85551 (and if so add another test)?

https://github.com/llvm/llvm-project/pull/81271