aten::flatten's target-shape constant is now emitted as a single i64
constant instead of an i32 Concat subgraph that later const-folds.
Topology is unchanged (1355 ops, identical op-type histogram) and the
compiled outputs are bitwise identical. (#1)
- Regenerate reference IR on OpenVINO 2026.5 nightly (acf699076121dd9b7c34be5b5ce577780881032b)
