Use upgrader_mobile.cpp as the reference for codegen unittest (#71930)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71930
Previously `fbcode/caffe2/test/mobile/test_upgrader_bytecode_table_example.cpp` was checked in as intermediate step to make sure upgrader codegen works properly, before upgrader codegen is actually being used.
this change use `buck run mode/opt //caffe2/torch/fb/mobile/upgrader_codegen:upgrader_codegen` to codegen `upgrader_mobile.cpp` and we no longer need to use the checkin file `test_upgrader_bytecode_table_example.cpp` for the codegen unit test.
ghstack-source-id: 147957826
Test Plan:
```
buck test mode/opt //caffe2/test:upgrader_codegen
```
Reviewed By: tugsbayasgalan
Differential Revision: D33746264
fbshipit-source-id: 18de3cae53aed966e67f8dc42976a2d10d3788b3
(cherry picked from commit 661ffa786063d3e47cd7bcbe16b3baf2fff74808)
