[llvm] [VPlan] Expand VPBlendRecipes to select instructions. NFC (PR #133993)

[Florian Hahn via llvm-commits]

================
@@ -2711,6 +2711,20 @@ void VPlanTransforms::convertToConcreteRecipes(VPlan &Plan,
         continue;
       }
 
+      // Expand VPBlendRecipe into VPInstruction::Select
----------------
fhahn wrote:

```suggestion
      // Expand VPBlendRecipe into VPInstruction::Select.
```

https://github.com/llvm/llvm-project/pull/133993