Switched to tracing overloads by default (#80013)
There are many cases where it's more convenient to use overloads, but we've hesitated in doing so since we can't torchscript it directly.
Luckily, it's pretty easy to strip overloads. See https://github.com/pytorch/functorch/pull/899
Pull Request resolved: https://github.com/pytorch/pytorch/pull/80013
Approved by: https://github.com/zou3519
