[flang-commits] [flang] [flang] Add [[maybe_unused]] to fix -Werror build (PR #83456)

[Pete Steinfeld via flang-commits]

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

Looks good.

Note that this looks like a compiler bug to me.  The variable `directive` is used on line 873, so this warning should not appear.

Thanks for fixing this!

https://github.com/llvm/llvm-project/pull/83456