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

llvm-svn: 188447
diff --git a/clang/test/CodeGenCXX/forward-enum.cpp b/clang/test/CodeGenCXX/forward-enum.cpp
index c1169e0..685e4f3 100644
--- a/clang/test/CodeGenCXX/forward-enum.cpp
+++ b/clang/test/CodeGenCXX/forward-enum.cpp
@@ -3,7 +3,7 @@
 enum MyEnum : char;
 void bar(MyEnum value) { }
 
-// CHECK: define void @_Z3foo6MyEnum
+// CHECK-LABEL: define void @_Z3foo6MyEnum
 void foo(MyEnum value)
 {
   // CHECK: call void @_Z3bar6MyEnum(i8 signext