[clang] [Clang][Sema][Builtins] Check argument count for `__builtin_allow_sanitize_check` (PR #183927)

[Aaron Ballman via cfe-commits]

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

LGTM as far as whack-a-mole goes, but I think a more general fix is now possible which would be interesting follow-up work if anyone is interested in taking a crack at it.

https://github.com/llvm/llvm-project/pull/183927