[clang][NFC] Remove non-builtin generic <stdbit.h> bit functions (#197069)

The non-builtin generic bit functions

stdc_leading_zeros
stdc_leading_ones
stdc_trailing_zeros
stdc_trailing_ones
stdc_first_leading_zero
stdc_first_leading_one
stdc_first_trailing_zero
stdc_first_trailing_one
stdc_count_zeros
stdc_count_ones
stdc_has_single_bit
stdc_bit_width
stdc_bit_floor
stdc_bit_ceil


could never be matched, and the corresponding
BIstdc_leading_zeros
BIstdc_leading_ones
BIstdc_trailing_zeros
BIstdc_trailing_ones
BIstdc_first_leading_zero
BIstdc_first_leading_one
BIstdc_first_trailing_one
BIstdc_first_trailing_zero
BIstdc_count_zeros
BIstdc_count_ones
BIstdc_has_single_bit
BIstdc_bit_floor
BIstdc_bit_ceil
BIstdc_bit_width

cases in CGBuiltin.cpp, ExprConstant.cpp,
InterpBuiltin.cpp, and SemaChecking.cpp are unreachable.

Followup: #185978
5 files changed
tree: 016f4471a58439b0c031c765cc670962150bf721
  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
README.md

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