[libc++] Remove unused __parent_pointer alias from __tree and map (#172185)

The `__parent_pointer` type alias was marked to be removed in
d163ab3323495560eb0255ac807da2bf24d3c629.
At that time, <map> still had uses of `__parent_pointer` as a local
variable type in operator[] and at()

Those uses were removed in 4a2dd31f16d60b65a46696a909efad5c11b18c19,
which refactored `__find_equal` to return a pair instead of using an out
parameter

However, the typedef in <map> and the alias in __tree were left behind

This patch removes the unused typedef from <map> and the
`__parent_pointer` alias from __tree

Signed-off-by: Krechals <topala.andrei@gmail.com>
2 files changed
tree: 3f725aa05068bd9f1e34d9bbf18e7573cbbdaa21
  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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