Fix tpu_strategy.py's corner bug which may add list with tuple b/c `DistributedValues.values` actually returns tuple.
Fix tpu_strategy.py's corner bug which may add list with tuple b/c `DistributedValues.values` actually returns tuple.

PiperOrigin-RevId: 365159809
Change-Id: Ib118106eaa9ad804683564f0b3df347f0ccb388a

karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,gautam1858/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-Corporation/tensorflow,karllessard/tensorflow,karllessard/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,Intel-Corporation/tensorflow,sarvex/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,sarvex/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,karllessard/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,Intel-tensorflow/tensorflow,yongtang/tensorflow,Intel-Corporation/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-tensorflow/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,gautam1858/tensorflow,yongtang/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-Corporation/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,sarvex/tensorflow,tensorflow/tensorflow-pywrap_saved_model,karllessard/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-tensorflow/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,yongtang/tensorflow,yongtang/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,karllessard/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-tensorflow/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow