[llvm] [VPlan] Introduce explicit ExtractFromEnd recipes for live-outs. (PR #100658)

[via llvm-commits]

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@@ -8517,20 +8534,121 @@ static void addLiveOutsForFirstOrderRecurrences(VPlan &Plan) {
   }
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ayalz wrote:

```suggestion
    // TODO: set MiddleBuilder to MiddleVPBB->getFirstNonPhi().
  }
```

https://github.com/llvm/llvm-project/pull/100658