Added additional checks for self assignment #616

Job	Run time
Syntax Check - Clang C++03 Linux No STL (ubuntu-22.04)	1m 10s
Syntax Check - Clang C++03 Linux STL (ubuntu-22.04)	1m 21s
Syntax Check - Clang C++11 Linux No STL (ubuntu-22.04)	1m 6s
Syntax Check - Clang C++11 Linux No STL Force C++03 (ubuntu-22.04)	1m 5s
Syntax Check - Clang C++11 Linux STL (ubuntu-22.04)	1m 18s
Syntax Check - Clang C++11 Linux STL Force C++03 (ubuntu-22.04)	1m 22s
Syntax Check - Clang C++14 Linux STL (ubuntu-22.04)	1m 19s
Syntax Check - Clang C++14 Linux No STL (ubuntu-22.04)	1m 8s
Syntax Check - Clang C++14 Linux STL Force C++03 (ubuntu-22.04)	1m 18s
Syntax Check - Clang C++14 Linux No STL Force C++03 (ubuntu-22.04)	1m 4s
Syntax Check - Clang C++17 Linux No STL (ubuntu-22.04)	1m 5s
Syntax Check - Clang C++17 Linux No STL Force C++03 (ubuntu-22.04)	1m 9s
Syntax Check - Clang C++17 Linux STL (ubuntu-22.04)	1m 25s
Syntax Check - Clang C++17 Linux STL Force C++03 (ubuntu-22.04)	1m 22s
Syntax Check - Clang C++20 Linux No STL (ubuntu-22.04)	1m 9s
Syntax Check - Clang C++20 Linux No STL Force C++03 (ubuntu-22.04)	1m 10s
Syntax Check - Clang C++20 Linux STL (ubuntu-22.04)	1m 17s
Syntax Check - Clang C++20 Linux STL Force C++03 (ubuntu-22.04)	1m 21s
	22m 9s

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