message: Updating std::variant with absl::variant.
diff: @@ -24,7 +24,7 @@ limitations under the License.
  namespace tensorflow {
  namespace tpu {
  Status TpuCompileOpKernelImpl::Compile(
  - const std::variant<MlirToHloArgs, FunctionToHloArgs>& computation,
  + const absl::variant<MlirToHloArgs, FunctionToHloArgs>& computation,
  const XLA_TpuMeshState* mesh_state,
  const std::vector<TensorShape>& arg_shapes,
  TpuProgramGroupInterface* tpu_program_group) {
  