[VPlan] Check for VPWidenLoadRecipe directly in truncateToMinBW. (NFCI).

Since ne
After a separate recipe has been introduced for wide loads in
a9bafe9, we can directly check for load recipes in the early
bail-out and remove the redundant bail out for stores.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

@@ -975,9 +975,7 @@ void VPlanTransforms::truncateToMinimalBitwidths(
            vp_depth_first_deep(Plan.getVectorLoopRegion()))) {
     for (VPRecipeBase &R : make_early_inc_range(*VPBB)) {
       if (!isa<VPWidenRecipe, VPWidenCastRecipe, VPReplicateRecipe,
-               VPWidenSelectRecipe, VPWidenMemoryRecipe>(&R))
-        continue;
-      if (isa<VPWidenStoreRecipe>(&R))
+               VPWidenSelectRecipe, VPWidenLoadRecipe>(&R))
         continue;
 
       VPValue *ResultVPV = R.getVPSingleValue();