[flang][OpenMP][NFC] Share SetSymbolDSA between semantics and lowering (#207826)

Move the DSA helper from the private OmpAttributeVisitor::SetSymbolDSA
into the public openmp-dsa header next to GetSymbolDSA, and share the
DSA flag set through a single GetDataSharingAttributeFlags().

This lets an upcoming metadirective lowering change reuse the helper to
set the predetermined DSA of the loop induction variables of a selected
variant. A loop-associated variant is resolved during lowering, so the
usual semantic DSA resolution never runs on its loop nest and lowering
must set those flags itself.

Assisted with Copilot.
3 files changed
tree: 8e215406ce39d93626a8871a1b17d11ad473e28e
  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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