[llvm] [SimplifyCFG] Fix hoisting problem in SimplifyCFG (PR #78615)

[via llvm-commits]

RouzbehPaktinat wrote:

> These things can make reviewing easier.
> 
> 1. Use [godbot](https://llvm.godbolt.org/) in PR descriptions
> 2. Add a Pre-commit to show the impact of the changes. e.g. [[MemCpyOpt] Combine alias metadatas when replacing byval arguments #70580](https://github.com/llvm/llvm-project/pull/70580)
> 3. Add a test case from the issue to PhaseOrder?
> 
> I'll start reviewing as soon as possible. :3 (I wasn't getting around to it this weekend.)



https://github.com/llvm/llvm-project/pull/78615