[LV] Remove unused variable after 38376de.

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -9378,7 +9378,6 @@ LoopVectorizationPlanner::tryToBuildVPlanWithVPRecipes(VFRange &Range) {
 
   VPRegionBlock *LoopRegion = Plan->getVectorLoopRegion();
   VPBasicBlock *HeaderVPBB = LoopRegion->getEntryBasicBlock();
-  VPBasicBlock *VPBB = HeaderVPBB;
   BasicBlock *HeaderBB = OrigLoop->getHeader();
   bool NeedsMasks =
       CM.foldTailByMasking() ||
@@ -9509,9 +9508,6 @@ LoopVectorizationPlanner::tryToBuildVPlanWithVPRecipes(VFRange &Range) {
     PrevVPBB = VPBB;
   }
 
-  // After here, VPBB should not be used.
-  VPBB = nullptr;
-
   assert(isa<VPRegionBlock>(Plan->getVectorLoopRegion()) &&
          !Plan->getVectorLoopRegion()->getEntryBasicBlock()->empty() &&
          "entry block must be set to a VPRegionBlock having a non-empty entry "