[VPlan] Get address space from inferred pointer type (NFC)

Remove a use of the underlying ingredient by getting the address space
from the inferred pointer type.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -2684,8 +2684,8 @@ InstructionCost VPWidenMemoryRecipe::computeCost(ElementCount VF,
   Type *Ty = toVectorTy(getLoadStoreType(&Ingredient), VF);
   const Align Alignment =
       getLoadStoreAlignment(const_cast<Instruction *>(&Ingredient));
-  unsigned AS =
-      getLoadStoreAddressSpace(const_cast<Instruction *>(&Ingredient));
+  unsigned AS = cast<PointerType>(Ctx.Types.inferScalarType(getAddr()))
+                    ->getAddressSpace();
 
   if (!Consecutive) {
     // TODO: Using the original IR may not be accurate.