[C++] Use 'nullptr'. Transforms edition.

llvm-svn: 207196
diff --git a/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp b/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp
index af04507..7c3a260 100644
--- a/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp
+++ b/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp
@@ -118,7 +118,8 @@
   SmallVector<ConstantInfo, 8> ConstantVec;
 public:
   static char ID; // Pass identification, replacement for typeid
-  ConstantHoisting() : FunctionPass(ID), TTI(0), DT(0), Entry(0) {
+  ConstantHoisting() : FunctionPass(ID), TTI(nullptr), DT(nullptr),
+                       Entry(nullptr) {
     initializeConstantHoistingPass(*PassRegistry::getPassRegistry());
   }