[llvm] [JumpThreading][Local] Redirect other phi values from BB to Succ except commom preds (PR #166390)

[Kunqiu Chen via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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Camsyn wrote:

Oh, this PR can eliminate the whole phis in bb if the common predecessors between bb and succ are the same 😀.

https://github.com/llvm/llvm-project/pull/166390