[VPlan] Adjust original position of convertToConcreteRecipes.

Restore the original position of the call before afef545
to fix a number of crashes.

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -7677,7 +7677,6 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
   VPlanTransforms::unrollByUF(BestVPlan, BestUF,
                               OrigLoop->getHeader()->getContext());
   VPlanTransforms::optimizeForVFAndUF(BestVPlan, BestVF, BestUF, PSE);
-  VPlanTransforms::convertToConcreteRecipes(BestVPlan);
 
   // Perform the actual loop transformation.
   VPTransformState State(&TTI, BestVF, BestUF, LI, DT, ILV.Builder, &ILV,
@@ -7741,6 +7740,7 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
   BestVPlan.prepareToExecute(ILV.getTripCount(),
                              ILV.getOrCreateVectorTripCount(nullptr),
                              CanonicalIVStartValue, State);
+  VPlanTransforms::convertToConcreteRecipes(BestVPlan);
 
   BestVPlan.execute(&State);