[llvm] [SimplifyCFG] Replace unreachable switch lookup table holes with poison (PR #94990)

[via llvm-commits]

DaMatrix wrote:

Okay, so I should remove all the logic for handling combinations of `undef` and `poison`, and instead assume that the lookup table values will always be either a `ConstantInt` or a `poison`?

https://github.com/llvm/llvm-project/pull/94990