Implementation of cpu_serial_kernel for TensorIterator (#25125)
Summary:
https://github.com/pytorch/pytorch/issues/24472
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25125
Differential Revision: D17073868
Pulled By: ifedan
fbshipit-source-id: 9df1a64669c97854ba436aafef59e79c22a21a7f
