[C++11] Use 'nullptr'.

llvm-svn: 210442
diff --git a/llvm/unittests/Support/ErrorOrTest.cpp b/llvm/unittests/Support/ErrorOrTest.cpp
index 18ce507..7ace5e3 100644
--- a/llvm/unittests/Support/ErrorOrTest.cpp
+++ b/llvm/unittests/Support/ErrorOrTest.cpp
@@ -54,10 +54,10 @@
 struct D : B {};
 
 TEST(ErrorOr, Covariant) {
-  ErrorOr<B*> b(ErrorOr<D*>(0));
-  b = ErrorOr<D*>(0);
+  ErrorOr<B*> b(ErrorOr<D*>(nullptr));
+  b = ErrorOr<D*>(nullptr);
 
-  ErrorOr<std::unique_ptr<B> > b1(ErrorOr<std::unique_ptr<D> >(0));
-  b1 = ErrorOr<std::unique_ptr<D> >(0);
+  ErrorOr<std::unique_ptr<B> > b1(ErrorOr<std::unique_ptr<D> >(nullptr));
+  b1 = ErrorOr<std::unique_ptr<D> >(nullptr);
 }
 } // end anon namespace