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

llvm-svn: 188447
diff --git a/clang/test/CodeGenCXX/mangle-alias-template.cpp b/clang/test/CodeGenCXX/mangle-alias-template.cpp
index 5ace0b0..b6719c5 100644
--- a/clang/test/CodeGenCXX/mangle-alias-template.cpp
+++ b/clang/test/CodeGenCXX/mangle-alias-template.cpp
@@ -15,7 +15,7 @@
 template<typename T, typename U> using U = S<T, int, U>;
 template<typename...Ts> void h(U<Ts...>, Ts...);
 
-// CHECK: define void @_Z1zv(
+// CHECK-LABEL: define void @_Z1zv(
 void z() {
   vector<int> VI;
   f(VI);