[llvm] [VectorCombine] New folding pattern for extract/binop/shuffle chains (PR #145232)

[Simon Pilgrim via llvm-commits]

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@@ -2910,6 +2911,133 @@ bool VectorCombine::foldShuffleFromReductions(Instruction &I) {
   return foldSelectShuffle(*Shuffle, true);
 }
 
+bool VectorCombine::foldShuffleChainsToReduce(Instruction &I) {
+  auto *SVI = dyn_cast<ShuffleVectorInst>(&I);
+  if (!SVI)
+    return false;
+
+  std::queue<Value *> Worklist;
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RKSimon wrote:

Best not to use Worklist as it will shadow VectorCombine::Worklist

https://github.com/llvm/llvm-project/pull/145232