Implement putc for TF backend
Implement putc for TF backend

shinh/elvm,shinh/elvm,shinh/elvm,ND-CSE-30151/elvm,shinh/elvm,shinh/elvm,ND-CSE-30151/elvm,ND-CSE-30151/elvm,shinh/elvm,shinh/elvm,shinh/elvm