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

llvm-svn: 188447
diff --git a/clang/test/CodeGen/link-bitcode-file.c b/clang/test/CodeGen/link-bitcode-file.c
index 7b2bfd6..cf9493f 100644
--- a/clang/test/CodeGen/link-bitcode-file.c
+++ b/clang/test/CodeGen/link-bitcode-file.c
@@ -13,12 +13,12 @@
 
 #else
 
-// CHECK-NO-BC: define i32 @g
+// CHECK-NO-BC-LABEL: define i32 @g
 // CHECK-NO-BC: ret i32 42
 int g(void) {
   return f();
 }
 
-// CHECK-NO-BC: define i32 @f
+// CHECK-NO-BC-LABEL: define i32 @f
 
 #endif