[llvm] [SLP] Initial vectorization of non-power-of-2 ops. (PR #77790)

[Florian Hahn via llvm-commits]

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@@ -2733,6 +2737,9 @@ class BoUpSLP {
                           SmallVectorImpl<Value *> *OpScalars = nullptr,
                           SmallVectorImpl<Value *> *AltScalars = nullptr) const;
 
+    /// Return the number of padding lanes (containg poison) for this node.
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fhahn wrote:

Completely reworded the comment, as the padding lanes concept is gone now.

https://github.com/llvm/llvm-project/pull/77790