pytorch

45692fbe - [fx splitter][fx net_min] Move Splitter, Minimizer and necessary deps to OSS (#56201)

[fx splitter][fx net_min] Move Splitter, Minimizer and necessary deps to OSS (#56201) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/56201 Refactor Splitter and Minimizer to superclass `_SplitterBase` and `_MinimizerBase` and move them to OSS. This is needed to create an OSS example of GPU lowering with those tools. Test Plan: CI Reviewed By: jackm321 Differential Revision: D27629598 fbshipit-source-id: 0d4da02105ca509b31f1a6c4a39b1122c2bc7bf0