[llvm] [LV] Reduce register usage for scaled reductions (PR #133090)

[Florian Hahn via llvm-commits]

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@@ -2063,17 +2066,19 @@ class VPReductionPHIRecipe : public VPHeaderPHIRecipe,
 /// scalar value.
 class VPPartialReductionRecipe : public VPSingleDefRecipe {
   unsigned Opcode;
+  unsigned VFScaleFactor;
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fhahn wrote:

wuld be good to add a comment here

https://github.com/llvm/llvm-project/pull/133090