Revert D25544731: [PyTorch] Avoid extra Tensor refcounting in _cat_out_cpu
Test Plan: revert-hammer
Differential Revision:
D25544731 (https://github.com/pytorch/pytorch/commit/1a0510463a53fd97abbf7ead52cc259f523088ae)
Original commit changeset: 7b9656d0371a
fbshipit-source-id: 0f7ea74eca282cadf269bbd284d59650a431ed65
