[OpenACC][NFCI] Implement 'helpers' for all of the clauses I've used so far (#137396)

As a follow up to 3c4dff3ac6884b85fe93fe512c5bdaf014738c45 I audited all
uses of 'process clause and use additive methods', and added explicit
functions to the construct to make it easier for the next project to
attempt to use this mechanism (vs construct all operands/etc in advance,
then add all at once).

I've only done ones that I have attempted to use so far(as a catch-up,
so no var-list clauses, and no constructs that can't be used without a
var-list, and no loop, and no compound constructs). I intend to do those
"as I go" with the lowering of each of those things instead.

---------

Co-authored-by: Andy Kaylor <akaylor@nvidia.com>
3 files changed
tree: 20788edfaf17b36afca42a16bed7822c2b106aeb
  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. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
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