Disable tracing for Pytorch Mobile client (#36007)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36007
Tracing is not needed in Pytorch Mobile client. Disabling it has a couple of benefits:
1. It's a pre-requisite to build lite interpreter.
2. It saves the code size for full jit and Federated learning (around 600k).
Solution: use PYTORCH_DISABLE_TRACING to disable it. It's better than passing an argument to code-gen because:
1. It's a single-point change in the code template for both VariableType and VariableFactories.
2. code-gen does not handle VariableTypeManual.cpp. The macro is need there anyway.
ghstack-source-id: 101529401
Test Plan: CI
Reviewed By: ljk53
Differential Revision: D20852558
fbshipit-source-id: c28cec9f90208974acfa351ec9aec3fabbbb8aac
