message: Fixing Toco for exporting graphs with strings
  If the graph contains not constant array with strings it fails because the
  array's size can't be estimated.
diff: @@ -1237,12 +1237,16 @@ void DedupeConstantArrays(Model* model, size_t min_size) {
  lhs_array.final_data_type != ArrayDataType::kNone
  ? lhs_array.final_data_type
  : lhs_array.data_type;
  + // Ignore small arrays, don't check string arrays because it is not possible
  + // to estimate its size.
  + if (final_data_type != ArrayDataType::kString) {
  size_t array_byte_size =
  lhs_array.buffer->Length() * ElementSize(final_data_type);
  if (array_byte_size < min_size) {
  // Too small; skip.
  continue;
  }
  + }
  auto next_lhs_array_it = lhs_array_it;
  ++next_lhs_array_it;
  