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

[via llvm-commits]

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@@ -1120,6 +1122,133 @@ bool VPlanTransforms::handleMaxMinNumReductions(VPlan &Plan) {
   return true;
 }
 
+/// For argmin/argmax reductions with strict predicates, convert the existing
+/// FindLastIV reduction to a new UMin reduction of a wide canonical IV. If the
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ayalz wrote:

```suggestion
/// FindFirstIV reduction to a new UMin reduction of a wide canonical IV. If the
```

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