[llvm] [VPlan] Introduce ComputeReductionResult VPInstruction opcode. (PR #70253)

[via llvm-commits]

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@@ -7585,7 +7393,36 @@ static void AddRuntimeUnrollDisableMetaData(Loop *L) {
   }
 }
 
-SCEV2ValueTy LoopVectorizationPlanner::executePlan(
+// Check if RedResult is a CompueReductionResult instruction, and if it is
+// add it to \p ReductionResumeValues with the merge phi node for it.
+static void getMergePhiForReduction(
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ayalz wrote:

```suggestion
static void collectMergePhiForReduction(
```

https://github.com/llvm/llvm-project/pull/70253