[flang][hlfir][NFC] catch dynamically optional args with no lowering These should be lowered with genOptionalValue as in D154897, but I haven't found any cases where this code path is actually hit (flang tests, gfortran test suite), so I don't think it would be testable. Adding an assertion for if this code path ever becomes live. Differential Revision: https://reviews.llvm.org/D155477
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