[llvm] Revert "[BasicBlockUtils] Handle funclets when detaching EH pad blocks" (PR #158364)

[Gábor Spaits via llvm-commits]

spaits wrote:

I have a version, in which your LLVM-IR works. I will do some testing with it. If it works fine there I will create the PR.

https://github.com/llvm/llvm-project/pull/158364