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

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XChy wrote:

Thanks for your help! I have posted an issue in flang channel.

> Trouble is, that these kinds of problems are hard to solve. If your optimization is safe, it may be exposing some other mis-compilation.

Your explanation makes sense to me. That'll take some time to pinpoint where the problems are.


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