Add GET_ATTR instruction (#25151)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25151
The prim::GetAttr operator depends on node. However, in lite interpreter there will be no node dependency. Promote the operator to a first-class instruction.
Test Plan: Imported from OSS
Differential Revision: D17076412
fbshipit-source-id: 8de20978445bb598634c5462e66e4459dcd567be
