[clang-tools-extra] [clang-tidy] Avoid checking magic numbers if _BitInt (PR #65888)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL approved this pull request.

LGTM, 
not perfect, as we going to ignore big ints, but still better than crashing for now.

https://github.com/llvm/llvm-project/pull/65888