[llvm] [LV] Support argmin/argmax with strict predicates. (PR #170223)

[via llvm-commits]

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@@ -1203,33 +1328,42 @@ bool VPlanTransforms::handleMultiUseReductions(VPlan &Plan) {
                            FindIVPhiR->getRecurrenceKind()))
       return false;
 
+    assert(!FindIVPhiR->isInLoop() && !FindIVPhiR->isOrdered() &&
+           "cannot handle inloop/ordered reductions yet");
+
     // TODO: Support cases where IVOp is the IV increment.
     if (!match(IVOp, m_TruncOrSelf(m_VPValue(IVOp))) ||
         !isa<VPWidenIntOrFpInductionRecipe>(IVOp))
       return false;
 
-    CmpInst::Predicate RdxPredicate = [RdxKind]() {
+    // Check if the predicate is compatible with the reduction kind.
+    bool IsValidPredicate = [RdxKind, Pred]() {
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ayalz wrote:

```suggestion
    bool IsValidKindPred = [RdxKind, Pred]() {
```

https://github.com/llvm/llvm-project/pull/170223