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

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

looks like the premerge flaked on lldb tests

when a PR breaks something, usually we revert to green, and then you are free to reland with a fix: https://llvm.org/docs/DeveloperPolicy.html#patch-reversion-policy

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