[clang] [llvm] [Clang] restrict use of attribute names reserved by the C++ standard (PR #106036)

[Oleksandr T. via llvm-commits]

a-tarasyuk wrote:

@AaronBallman @erichkeane I’ve switched back to the version without the std check. should the diagnostic group be changed?

https://github.com/llvm/llvm-project/pull/106036