*   `tensorflow/core/ir/` contains a new MLIR-based Graph dialect that is
        isomorphic to GraphDef and will be used to replace GraphDef-based (e.g.,
        Grappler) optimizations.
    *   Deprecated and removed `attrs()` function in shape inference. All
        attributes should be queried by name now (rather than range returned) to
        enable changing the underlying storage there.