[C++11] Use 'nullptr'.

llvm-svn: 210442
diff --git a/llvm/unittests/IR/WaymarkTest.cpp b/llvm/unittests/IR/WaymarkTest.cpp
index 9a9b4a2..8e3cd45 100644
--- a/llvm/unittests/IR/WaymarkTest.cpp
+++ b/llvm/unittests/IR/WaymarkTest.cpp
@@ -31,7 +31,7 @@
   FunctionType *FT = FunctionType::get(Type::getVoidTy(getGlobalContext()), true);
   Function *F = Function::Create(FT, GlobalValue::ExternalLinkage);
   const CallInst *A = CallInst::Create(F, makeArrayRef(values));
-  ASSERT_NE(A, (const CallInst*)NULL);
+  ASSERT_NE(A, (const CallInst*)nullptr);
   ASSERT_EQ(1U + 22, A->getNumOperands());
   const Use *U = &A->getOperandUse(0);
   const Use *Ue = &A->getOperandUse(22);