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

llvm-svn: 188447
diff --git a/clang/test/CodeGenCXX/fp16-mangle.cpp b/clang/test/CodeGenCXX/fp16-mangle.cpp
index 4a056d6..bd5a319 100644
--- a/clang/test/CodeGenCXX/fp16-mangle.cpp
+++ b/clang/test/CodeGenCXX/fp16-mangle.cpp
@@ -4,9 +4,9 @@
 template <typename T, typename U> struct S { static int i; };
 template <> int S<__fp16, __fp16>::i = 3;
 
-// CHECK: define void @_Z1fPDh(i16* %x)
+// CHECK-LABEL: define void @_Z1fPDh(i16* %x)
 void f (__fp16 *x) { }
 
-// CHECK: define void @_Z1gPDhS_(i16* %x, i16* %y)
+// CHECK-LABEL: define void @_Z1gPDhS_(i16* %x, i16* %y)
 void g (__fp16 *x, __fp16 *y) { }