[llvm] [VPlan] Model FOR extract of exit value in VPlan. (PR #93395)

[via llvm-commits]

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@@ -812,6 +812,8 @@ bool VPlanTransforms::adjustFixedOrderRecurrences(VPlan &Plan,
     if (auto *FOR = dyn_cast<VPFirstOrderRecurrencePHIRecipe>(&R))
       RecurrencePhis.push_back(FOR);
 
+  VPBuilder MiddleBuilder(
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ayalz wrote:

Worth renaming `Builder` here to, say, `LoopBuilder`?

https://github.com/llvm/llvm-project/pull/93395