[llvm] [LV] Vectorize selecting last IV of min/max element. (PR #141431)

[via llvm-commits]

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@@ -225,6 +259,10 @@ bool RecurrenceDescriptor::AddReductionVar(
   if (Phi->getParent() != TheLoop->getHeader())
     return false;
 
+  if (auto RD = getMultiUseMinMax(Phi, Kind, TheLoop)) {
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ayalz wrote:

As a simple early-exit case of AddReductionVar(), should getMultiUseMinMax() also return bool and receive a reference of `RecurrenceDescriptor` as parameter, rather than return an optional? Name could also be more aligned.

https://github.com/llvm/llvm-project/pull/141431