[clang] [clang-format] Add additional custom words for equivalent clang-format on/off functionality (PR #123543)

[Björn Schäpers via cfe-commits]

https://github.com/HazardyKnusperkeks requested changes to this pull request.

You shouldn't do that in ClangFormat.cpp, because tools which use libformat directly would suddenly behave different as clang-format.

https://github.com/llvm/llvm-project/pull/123543