SLPVectorizer: Use use_empty instead of getNumUses

Author: arsenm

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -6749,7 +6749,7 @@ BoUpSLP::getReorderingData(const TreeEntry &TE, bool TopToBottom,
     auto PHICompare = [&](unsigned I1, unsigned I2) {
       Value *V1 = TE.Scalars[I1];
       Value *V2 = TE.Scalars[I2];
-      if (V1 == V2 || (V1->getNumUses() == 0 && V2->getNumUses() == 0))
+      if (V1 == V2 || (V1->use_empty() && V2->use_empty()))
         return false;
       if (isa<PoisonValue>(V1))
         return true;