[lldb][DWARFASTParserClang] Make GetCXXObjectParameter public and call it from unit-tests (#144879)

My goal is to remove the `object_pointer` member on
`ParsedDWARFTypeAttributes` since it's duplicating information that we
retrieve with `GetCXXObjectParameter` anyway. To continue having
coverage for the `DW_AT_object_pointer` code-paths, instead of checking
the
`attrs.object_pointer` I'm now calling `GetCXXObjectParameter` directly.
We could find some very roundabout way to go via the Clang AST to check
that the object parameter was parsed correctly, but that quickly became
quite painful.

Depends on https://github.com/llvm/llvm-project/pull/144876
3 files changed
tree: 5e820c4f62978fecce8c93c808a8cd8501447f78
  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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