[VPlan] Use transferSuccessors in mergeBlocksIntoPredecessors (NFC). (#189275) transferSuccessors is more compact and is guaranteed to preserve the predecessor/successor order properly in all cases. This is not an issue today, but will when used in more places, including #186252. Split off from approved https://github.com/llvm/llvm-project/pull/186252. PR: https://github.com/llvm/llvm-project/pull/189275
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