isl_test_cpp17-generic.cc: work around std::optional::value issue in older macOS

[isl.git] / test_inputs / flow / multi_source2.ai

sink: { S[] -> a[] }
must_source: { T[] -> a[] }
may_source: { U[] -> a[] }
schedule_map: { T[] -> [0]; U[] -> [0]; S[] -> [1] }