Print aot graphs if user specifies aot graph env vars (#92720)
When integrating AOT logging with TorchInductor trace, the ability to print graphs to the console if the user specified any of the env vars was removed (in favor of using TORCH_COMPILE_DEBUG). This restores this by checking if the user set any of the aot debug variables *before* setting up the remainder of the logging, and adding a stream to stdout if any of those env vars are set.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/92720
Approved by: https://github.com/Chillee
