[C++11] Use 'nullptr'.

llvm-svn: 208280
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 01eced2..4d06648 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -69,7 +69,7 @@
   FloatFormat = &llvm::APFloat::IEEEsingle;
   DoubleFormat = &llvm::APFloat::IEEEdouble;
   LongDoubleFormat = &llvm::APFloat::IEEEdouble;
-  DescriptionString = 0;
+  DescriptionString = nullptr;
   UserLabelPrefix = "_";
   MCountName = "mcount";
   RegParmMax = 0;