[llvm] [VectorCombine] Combine scalar fneg with insert/extract to vector fneg when length is different (PR #115209)

[Simon Pilgrim via llvm-commits]

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@@ -682,7 +682,8 @@ bool VectorCombine::foldInsExtFNeg(Instruction &I) {
   std::iota(Mask.begin(), Mask.end(), 0);
   Mask[Index] = Index + NumElts;
 
-  Type *ScalarTy = VecTy->getScalarType();
+  Type *ScalarTy = SrcVecTy->getScalarType();
+  TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput;
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RKSimon wrote:

Remove this (CostKind is now a VectorCombine class member)

https://github.com/llvm/llvm-project/pull/115209