[pytorch] Add broadcasting support to add_relu kernel (#61584)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61584
add_relu is not working with broadcasting. This registers a scalar version of add_relu in native_functions that casts to tensor before calling the regular function. TensorIterator handles broadcasting analogously to existing add.
ghstack-source-id: 133480068
Test Plan: python3 test/test_nn.py TestAddRelu
Reviewed By: kimishpatel
Differential Revision: D29641768
fbshipit-source-id: 1b0ecfdb7eaf44afed83c9e9e74160493c048cbc
