[llvm] [VPlan] Fix first-order splices without header mask not using EVL (PR #146672)

[Alexey Bataev via llvm-commits]

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@@ -2114,21 +2114,19 @@ void VPlanTransforms::addActiveLaneMask(
     HeaderMask->replaceAllUsesWith(LaneMask);
 }
 
-/// Try to convert \p CurRecipe to a corresponding EVL-based recipe. Returns
-/// nullptr if no EVL-based recipe could be created.
+/// Try to optimize a \p CurRecipe masked by \p HeaderMask to a corresponding
+/// EVL-based recipe without the mask. Returns nullptr if no EVL-based recipe
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alexey-bataev wrote:

```suggestion
/// EVL-based recipe. Returns nullptr if no EVL-based recipe
```
The mask still may be generated

https://github.com/llvm/llvm-project/pull/146672