[VPlan] Use load/store opcode for VPWiden(Load|Store)EVLRecipe (NFC).

Removes unnecessary uses of Ingredient.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -3010,7 +3010,7 @@ InstructionCost VPWidenLoadEVLRecipe::computeCost(ElementCount VF,
   unsigned AS =
       getLoadStoreAddressSpace(const_cast<Instruction *>(&Ingredient));
   InstructionCost Cost = Ctx.TTI.getMaskedMemoryOpCost(
-      Ingredient.getOpcode(), Ty, Alignment, AS, Ctx.CostKind);
+      Instruction::Load, Ty, Alignment, AS, Ctx.CostKind);
   if (!Reverse)
     return Cost;
 
@@ -3125,7 +3125,7 @@ InstructionCost VPWidenStoreEVLRecipe::computeCost(ElementCount VF,
   unsigned AS =
       getLoadStoreAddressSpace(const_cast<Instruction *>(&Ingredient));
   InstructionCost Cost = Ctx.TTI.getMaskedMemoryOpCost(
-      Ingredient.getOpcode(), Ty, Alignment, AS, Ctx.CostKind);
+      Instruction::Store, Ty, Alignment, AS, Ctx.CostKind);
   if (!Reverse)
     return Cost;