generate ATen core files with LF. (#14667)

generate ATen core files with LF. (#14667)

Summary:
on Windows environment, some ATen core files (Type.h, Tensor.h, TensorMethods.h) are created and it's new line code is CRLF. (maybe enviconment dependant)
therefore, comparing files is failed in generate_outputs()agener917.py and compilation stopped.
this patch generates these files with LF forcibly.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/14667

Differential Revision: D13356170

Pulled By: ezyang

fbshipit-source-id: ef8cc3a6cc8bf3c45b78e9eb3df98cf47c0d33bb