Add add_relu fusion pass to optimize_for_mobile. (#40252)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40252
As title says.
Test Plan:
python test/test_mobile_optimizer.py
Imported from OSS
Differential Revision: D22126825
fbshipit-source-id: a1880587ba8db9dee0fa450bc463734e4a8693d9
