Fix cost analysis after rebase.

Author: Leon Clark

llvm/lib/Transforms/Vectorize/VectorCombine.cpp

@@ -4056,10 +4056,12 @@ bool VectorCombine::shrinkPhiOfShuffles(Instruction &I) {
 
   // Calculate costs for worst cases and compare.
   auto const Kind = TTI::SK_PermuteSingleSrc;
-  auto OldCost = std::max(TTI.getShuffleCost(Kind, InputVT, Mask0, CostKind),
-                          TTI.getShuffleCost(Kind, InputVT, Mask1, CostKind));
-  auto NewCost = TTI.getShuffleCost(Kind, InputVT, NewMask, CostKind) +
-                 TTI.getShuffleCost(Kind, InputVT, Mask1, CostKind);
+  auto OldCost =
+      std::max(TTI.getShuffleCost(Kind, ResultVT, InputVT, Mask0, CostKind),
+               TTI.getShuffleCost(Kind, ResultVT, InputVT, Mask1, CostKind));
+  auto NewCost =
+      TTI.getShuffleCost(Kind, InputVT, InputVT, NewMask, CostKind) +
+      TTI.getShuffleCost(Kind, ResultVT, InputVT, Mask1, CostKind);
 
   if (NewCost > OldCost)
     return false;