Updating files for missing licenses (#637)

test/common/PtrUnion.hpp

@@ -1,3 +1,9 @@
+/*************************************************************************
+ * Copyright (c) 2022 Advanced Micro Devices, Inc. All rights reserved.
+ *
+ * See LICENSE.txt for license information
+ ************************************************************************/
+
 #pragma once
 #include "ErrCode.hpp"
 #include "rccl/rccl.h"