[llvm] [VPlan] Replace RdxDesc with RecurKind in VPReductionPHIRecipe (NFC). (PR #142322)

[via llvm-commits]

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@@ -2240,9 +2240,7 @@ class VPReductionPHIRecipe : public VPHeaderPHIRecipe,
              VPSlotTracker &SlotTracker) const override;
 #endif
 
-  const RecurrenceDescriptor &getRecurrenceDescriptor() const {
-    return RdxDesc;
-  }
+  RecurKind getRecurrenceKind() const { return Kind; }
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ayalz wrote:

```suggestion
  /// Returns the recurrence kind of the reduction.
  RecurKind getRecurrenceKind() const { return Kind; }
```

https://github.com/llvm/llvm-project/pull/142322