Only print guard code when printing guards (#98347)
Before:
<img width="1138" alt="image" src="https://user-images.githubusercontent.com/13564/229915726-19bddea8-8fa4-46d2-8501-358e9f9ea639.png">
After:
```
[2023-04-04 13:44:23,109] torch._dynamo.convert_frame.__guards: [DEBUG] GUARDS:
___check_obj_id(L['self'], 139844089003936)
not ___are_deterministic_algorithms_enabled()
```
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98347
Approved by: https://github.com/voznesenskym
