Copy "optional" property when cloning Identifier node (#9333) 
Copy "optional" property when cloning Identifier node (#9333) 

Fixes #9331
babel/babel,jridgewell/babel,jridgewell/babel,kaicataldo/babel,Skillupco/babel,babel/babel,kaicataldo/babel,kaicataldo/babel,babel/babel,hzoo/babel,Skillupco/babel,hzoo/babel,hzoo/babel,jridgewell/babel,babel/babel,kaicataldo/babel,Skillupco/babel,hzoo/babel,jridgewell/babel,Skillupco/babel