[lldb][test] Test all libcxxabi demangler test-cases against TrackingOutputBuffer (#137793)

To test the infrastructure added in
https://github.com/llvm/llvm-project/pull/131836 in would be nice to
confirm that we can reconstruct all kinds of demangled names. The
libcxxabi test-suite already has all those test-cases.

This patch copies those test-cases (taken from
`libcxxabi/test/test_demangle.pass.cpp`), reconstructs the name like
LLDB would when showing backtraces, and confirms that all demangled
names can be fully reconstructed.

Two open questions:
1. Do we really want a copy of all those test-cases in LLDB? It's
unlikely to be kept in sync with the demangler test-suite. It includes
30,000+ test-cases
2. Do we want to turn the
`GetDemangledBasename`/`GetDemangledScope`/etc. into public APIs (e.g.,
on `TrackingOutputBuffer`) so that we can use the exact same method of
extraction in the tests?
1 file changed
tree: ef406db7ce4ee4665c607d19d17a86ca2e2a106c
  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
README.md

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