[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>
1 file changed
tree: b696747070fa9a06a9953f62b493d8b8b26cd8af
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libsycl/
  16. libunwind/
  17. lld/
  18. lldb/
  19. llvm/
  20. llvm-libgcc/
  21. mlir/
  22. offload/
  23. openmp/
  24. orc-rt/
  25. polly/
  26. runtimes/
  27. third-party/
  28. utils/
  29. .clang-format
  30. .clang-format-ignore
  31. .clang-tidy
  32. .git-blame-ignore-revs
  33. .gitattributes
  34. .gitignore
  35. .mailmap
  36. CODE_OF_CONDUCT.md
  37. CONTRIBUTING.md
  38. LICENSE.TXT
  39. pyproject.toml
  40. README.md
  41. SECURITY.md
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