[llvm] [VPlan] Handle regions with live-outs and scalar VF when replicating. (PR #186252)

[via llvm-commits]

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ayalz wrote:

```suggestion
      // For scalar VF, all operands are already scalar; no extraction needed.
      if (!VF.isScalar()) {
        for (const auto &[I, Op] : enumerate(OldR.operands())) {
```

https://github.com/llvm/llvm-project/pull/186252