pytorch

7774a4e9 - [Static Runtime] Implement prim::VarStack out variant (#63579)

[Static Runtime] Implement prim::VarStack out variant (#63579) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/63579 Provide a static runtime out variant implementation for the new op introduced in D30426232 (https://github.com/pytorch/pytorch/commit/1385f9fb12e6607c98d2d9d5edaaaab2bc07386f). Test Plan: `buck test //caffe2/benchmarks/static_runtime:static_runtime_cpptest -- IndividualOps_VarStack` Reviewed By: navahgar Differential Revision: D30410525 fbshipit-source-id: bc59a3d8ad23e3d94561ec2dca9cc20687dbadf8