Don't handle bias inside cudnn_convolution* (#31524)
Summary:
Compared to cuDNN bias, PyTorch add has the following advantage:
- faster, especially for backward (see: https://github.com/zasdfgbnm/things/blob/master/2019/conv-backward-profile.md)
- handles 64bit indexing automatically
- has less code, less maintenance effort
ngimel I submit this PR early so the CI could start building it. But I have not tested it locally yet (still waiting for compiling).
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31524
Differential Revision: D19264244
Pulled By: ngimel
fbshipit-source-id: cb483d378a6d8bce0a05c3643a796e544bd8e8f0
