[ORC] Add comment on include guard #endif

Author: lhames

llvm/include/llvm/ExecutionEngine/Orc/ReOptimizeLayer.h

@@ -178,4 +178,4 @@ class ReOptimizeLayer : public IRLayer, public ResourceManager {
 } // namespace orc
 } // namespace llvm
 
-#endif
+#endif // LLVM_EXECUTIONENGINE_ORC_REOPTIMIZELAYER_H