nvfuser torchbench patch (#84411)
1. Patching nvfuser_execute to take aten nvprim fallback when no cuda tensors are provided as inputs
2. Extending support of nvfuser python API on cpu scalar tensor.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84411
Approved by: https://github.com/ngimel, https://github.com/kevinstephano, https://github.com/IvanYashchuk
