merged[indices[m][i], ...] = data[m][i, ...]
```

Each `data[i].shape` must start with the corresponding `indices[i].shape`,
and the rest of `data[i].shape` must be constant w.r.t. `i`.  That is, we
must have `data[i].shape = indices[i].shape + constant`.  In terms of this
`constant`, the output shape is

    merged.shape = [max(indices) + 1] + constant

*   Tracing/timeline support for distributed runtime (no GPU profiler yet).
*   C API gives access to inferred shapes with `TF_GraphGetTensorNumDims` and
    `TF_GraphGetTensorShape`.
*   Shape functions for core ops have moved to C++ via
    `REGISTER_OP(...).SetShapeFn(...)`. Python shape inference RegisterShape
    calls use the C++ shape functions with `common_shapes.call_cpp_shape_fn`. A
    future release will remove `RegisterShape` from python.

2CCF          ; valid                                  # 4.1  COPTIC SMALL LETTER OLD COPTIC HA
2CD0          ; mapped                 ; 2CD1          # 4.1  COPTIC CAPITAL LETTER L-SHAPED HA
2CD1          ; valid                                  # 4.1  COPTIC SMALL LETTER L-SHAPED HA
2CD2          ; mapped                 ; 2CD3          # 4.1  COPTIC CAPITAL LETTER OLD COPTIC HEI