[llvm] [LowerSwitch] Don't let pass manager handle the dependency (PR #68662)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

I'm not really seeing the value in doing this unless we go toward completely removing the whole "required pass" concept of the legacy PM. But the legacy PM treats dependent analyses and passes the same way, so you'd have to rewrite the legacy PM and you might as well port everything to the new PM instead.

https://github.com/llvm/llvm-project/pull/68662