[llvm] [LV] Make partial-reduction naming consistent (NFC) (PR #222377)

[Florian Hahn via llvm-commits]

================
@@ -4947,12 +4947,12 @@ struct ExtendedReductionOperand {
   ReductionExtend ExtendA, ExtendB;
 };
 
-/// A chain of recipes that form a partial reduction. Matches either
+/// A collection of recipes that form a partial reduction. Matches either
 ///   reduction_bin_op (extended op, accumulator), or
 ///   reduction_bin_op (accumulator, extended op).
 /// The possible forms of the "extended op" are listed in
 /// matchExtendedReductionOperand.
-struct VPPartialReductionChain {
+struct VPPartialReduction {
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fhahn wrote:


```suggestion
struct VPPartialReductionLink {
```

+ maybe a sentence about what link means

https://github.com/llvm/llvm-project/pull/222377