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

[via llvm-commits]

XChy wrote:

Sure, feel free to revert it. But the buildbot's log confuse me with something related to flang and SLPVectorizer. Could someone help me understand that?

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