[llvm] [SLP][NFC] Extract VectorizableTree into own ForestTree class (PR #222805)

[Ryan Buchner via llvm-commits]

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@@ -5384,7 +5410,12 @@ template <> struct llvm::DenseMapInfo<BoUpSLP::EdgeInfo> {
   }
 };
 
-template <> struct llvm::GraphTraits<BoUpSLP *> {
+struct SLPGraphView {
+  BoUpSLP *R;
+  BoUpSLP::ForestTree *FT;
+};
+
+template <> struct llvm::GraphTraits<SLPGraphView *> {
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bababuck wrote:

Had to add this extra struct to get `GraphTraits` to work. Do you know what this code is used for?

https://github.com/llvm/llvm-project/pull/222805