Added default move constructor and assignment operator for tstring.
Added default move constructor and assignment operator for tstring.

Also, minor cleanup of methods.

PiperOrigin-RevId: 262564087

aam-at/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,Intel-tensorflow/tensorflow,jhseu/tensorflow,adit-chandra/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,arborh/tensorflow,gunan/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,gautam1858/tensorflow,gunan/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,davidzchen/tensorflow,frreiss/tensorflow-fred,xzturn/tensorflow,jhseu/tensorflow,freedomtan/tensorflow,DavidNorman/tensorflow,davidzchen/tensorflow,chemelnucfin/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,petewarden/tensorflow,petewarden/tensorflow,cxxgtxy/tensorflow,arborh/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,adit-chandra/tensorflow,Intel-tensorflow/tensorflow,aam-at/tensorflow,DavidNorman/tensorflow,adit-chandra/tensorflow,gautam1858/tensorflow,adit-chandra/tensorflow,Intel-Corporation/tensorflow,DavidNorman/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,annarev/tensorflow,cxxgtxy/tensorflow,petewarden/tensorflow,gunan/tensorflow,DavidNorman/tensorflow,arborh/tensorflow,aldian/tensorflow,xzturn/tensorflow,frreiss/tensorflow-fred,ppwwyyxx/tensorflow,annarev/tensorflow,DavidNorman/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,gautam1858/tensorflow,freedomtan/tensorflow,renyi533/tensorflow,freedomtan/tensorflow,gunan/tensorflow,tensorflow/tensorflow,aldian/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,chemelnucfin/tensorflow,Intel-Corporation/tensorflow,jhseu/tensorflow,davidzchen/tensorflow,DavidNorman/tensorflow,DavidNorman/tensorflow,DavidNorman/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,petewarden/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,paolodedios/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,ppwwyyxx/tensorflow,adit-chandra/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,aam-at/tensorflow,ppwwyyxx/tensorflow,gautam1858/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,aldian/tensorflow,aldian/tensorflow,sarvex/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,annarev/tensorflow,tensorflow/tensorflow,jhseu/tensorflow,renyi533/tensorflow,gautam1858/tensorflow,gautam1858/tensorflow,gunan/tensorflow,adit-chandra/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,xzturn/tensorflow,sarvex/tensorflow,karllessard/tensorflow,annarev/tensorflow,gunan/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,xzturn/tensorflow,freedomtan/tensorflow,karllessard/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,chemelnucfin/tensorflow,jhseu/tensorflow,annarev/tensorflow,petewarden/tensorflow,jhseu/tensorflow,adit-chandra/tensorflow,arborh/tensorflow,chemelnucfin/tensorflow,karllessard/tensorflow,annarev/tensorflow,karllessard/tensorflow,aam-at/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,chemelnucfin/tensorflow,petewarden/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,freedomtan/tensorflow,Intel-tensorflow/tensorflow,adit-chandra/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,arborh/tensorflow,renyi533/tensorflow,Intel-tensorflow/tensorflow,gunan/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,ppwwyyxx/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,renyi533/tensorflow,arborh/tensorflow,petewarden/tensorflow,chemelnucfin/tensorflow,davidzchen/tensorflow,xzturn/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,Intel-tensorflow/tensorflow,chemelnucfin/tensorflow,gautam1858/tensorflow,aam-at/tensorflow,yongtang/tensorflow,Intel-Corporation/tensorflow,gunan/tensorflow,annarev/tensorflow,karllessard/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,renyi533/tensorflow,tensorflow/tensorflow,arborh/tensorflow,chemelnucfin/tensorflow,yongtang/tensorflow,jhseu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