});
    addBuiltinToVhloConversions();

    addArgumentMaterialization(MaterializeIllegalCast);
    addSourceMaterialization(MaterializeIllegalCast);
    addTargetMaterialization(MaterializeIllegalCast);
  }

  Attribute convertEncoding(Attribute attr) const final {
    LLVM_DEBUG(llvm::dbgs() << "Converting encoding.\n" << attr << '\n');