[llvm] [VPlan] Demarcate VPIs that gen scalars (NFC) (PR #196207)

[Ramkumar Ramachandra via llvm-commits]

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@@ -1434,12 +1434,12 @@ class LLVM_ABI_FOR_TEST VPInstruction : public VPRecipeWithIRFlags,
 
   /// Returns true if we can generate a scalar for the first lane only if
   /// needed.
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artagnon wrote:

This would unfortunately conflate it with the comment for VPI::isSingleScalar?

https://github.com/llvm/llvm-project/pull/196207