Tensor method rename size()->numel() - 3/3 (#16747)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16747
Codemod generated with clangr shard mode, 25 files per diff,
Reviewed By: dzhulgakov
Differential Revision: D13944380
fbshipit-source-id: 2167e2092ab27d31a4d5ef6cfa4b65d192f597a8
