[flang][OpenMP] Add semantics test: named COMMON + member with firstprivate+lastprivate is valid (#162234) This adds a positive semantics test showing that: - A named COMMON block in a clause is equivalent to listing all explicit members. - The same list item may appear in both firstprivate and lastprivate on the same construct. The reporter example in #162033 therefore conforms to OpenMP and Flang is correct to accept it. This test documents and locks in that behavior to avoid regressions. <img width="1606" height="350" alt="image" src="https://github.com/user-attachments/assets/0b464c58-b9cc-43e0-8d1f-1c5a5b993bf6" /> Co-authored-by: Krish Gupta <krishgupta@Krishs-MacBook-Air.local>
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