pytorch

babd4499 - [JIT] Add aten::slice optimization (#63049)

[JIT] Add aten::slice optimization (#63049) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/63049 Given a graph produced from a function like this: ``` def foo(): li = [1, 2, 3, 4, 5, 6] return li[0:2] ``` This pass produces a graph like this: ``` def foo(): li = [1, 2] return li ``` These changes are mostly adapted from https://github.com/pytorch/pytorch/pull/62297/ Test Plan: `buck test //caffe2/test:jit -- TestPeephole` Reviewed By: eellison Differential Revision: D30231044 fbshipit-source-id: d12ee39f68289a574f533041a5adb38b2f000dd5