[llvm] [SimplifyCFG][Migrated] Transform for redirecting phis between unmergeable BB and SuccBB (PR #67275)

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XChy wrote:

It's hard to reproduce the error on my machine (No AArch64 architecture to compile and run it) ,and hard to get the IR before SLPVectorizer when bootstrapping and building with CMake configuration system. If it's a single file, I can use command line directly. But now I can't and have no idea how to debug it. Even with `llvm-stress`, I didn't reproduce on my machine. I'll highly appreciate it if anyone could give me guidance or share similar experience.

https://github.com/llvm/llvm-project/pull/67275