[C++11] Use 'nullptr'.

llvm-svn: 210442
diff --git a/llvm/unittests/Support/ThreadLocalTest.cpp b/llvm/unittests/Support/ThreadLocalTest.cpp
index dd4d706..ea751be 100644
--- a/llvm/unittests/Support/ThreadLocalTest.cpp
+++ b/llvm/unittests/Support/ThreadLocalTest.cpp
@@ -25,14 +25,14 @@
 TEST_F(ThreadLocalTest, Basics) {
   ThreadLocal<const S> x;
 
-  EXPECT_EQ(0, x.get());
+  EXPECT_EQ(nullptr, x.get());
 
   S s;
   x.set(&s);
   EXPECT_EQ(&s, x.get());
 
   x.erase();
-  EXPECT_EQ(0, x.get());
+  EXPECT_EQ(nullptr, x.get());
 }
 
 }