[flang] Use std::nullopt rather than {}.
Original-commit: flang-compiler/f18@9a740acf8346de10c0dda34ba2706980f9643802 Reviewed-on: https://github.com/flang-compiler/f18/pull/151
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Original-commit: flang-compiler/f18@9a740acf8346de10c0dda34ba2706980f9643802 Reviewed-on: https://github.com/flang-compiler/f18/pull/151