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

llvm-svn: 188447
diff --git a/clang/test/CodeGenCXX/c99-variable-length-array.cpp b/clang/test/CodeGenCXX/c99-variable-length-array.cpp
index d486f9b..2cd8e11 100644
--- a/clang/test/CodeGenCXX/c99-variable-length-array.cpp
+++ b/clang/test/CodeGenCXX/c99-variable-length-array.cpp
@@ -9,7 +9,7 @@
   ~Y();
 };
 
-// CHECK: define void @_Z1fiPPKc(
+// CHECK-LABEL: define void @_Z1fiPPKc(
 void f(int argc, const char* argv[]) {
   // CHECK: call void @_ZN1XC1Ev
   X x;