baby steps on patching inf/nan behavior & aten::amin support in nvfuser
Fixes #75622
1. Instead of getting max/min_value for reduction init value, we go with (-)infinity instead so we can properly preserve inf inputs;
2. Adding inf/(-)inf/nan for float value.
3. Adding aten::amin in nvfuser (@kevinstephano @rdspring1 for review)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75646
Approved by: https://github.com/rdspring1, https://github.com/kevinstephano, https://github.com/ngimel
