[llvm] Revert "[JumpThreading] Put a limit on the PHI nodes when duplicating a BB." (PR #188740)

[Slava Zakharin via llvm-commits]

vzakhari wrote:

@dianqk, I can try your patch on `SPEC2017/cam4`. Should I try this patch or should I try https://github.com/llvm/llvm-project/pull/189650?

https://github.com/llvm/llvm-project/pull/188740