torchdynamo: add convolution pointwise(unary) fusion kernel (#86581)
Support unary fusion of Convolution with:
- relu
- sigmoid
- tanh
- hardswish
- leaky_relu
- hardtanh
- gelu
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86581
Approved by: https://github.com/jgong5, https://github.com/jansel
