ConversionPatternRewriter& rewriter) const {
  auto tfl_custom = rewriter.create<TFL::CustomOp>(
      mhlo_custom_call.getLoc(), mhlo_custom_call.getResultTypes(),
      mhlo_custom_call.getInputs());
  tfl_custom.setCustomCodeAttr(
      rewriter.getStringAttr(mhlo_custom_call.getCallTargetName()));

  if (auto bc = mhlo_custom_call.getBackendConfig()) {
    if (auto stringattr = mlir::dyn_cast_or_null<mlir::StringAttr>(*bc)) {