CHECK-LABEL-ify some code gen tests to improve diagnostic experience when tests fail.

llvm-svn: 188447
diff --git a/clang/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp b/clang/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp
index 52f1cd3..911ddee 100644
--- a/clang/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp
+++ b/clang/test/CodeGenCXX/devirtualize-virtual-function-calls.cpp
@@ -79,7 +79,7 @@
   struct D : public B {
   };
   void f(D d) {
-    // CHECK: define void @_ZN5test31fENS_1DE
+    // CHECK-LABEL: define void @_ZN5test31fENS_1DE
     d.B::~B();
   }
 }