Fix debug dir bugs and minifier output directories (#87682)
Fixes https://github.com/pytorch/torchdynamo/issues/1758, https://github.com/pytorch/torchdynamo/issues/1752
- minifier_launcher.py now dumps checkpoints to \<cwd\>/checkpoints when run
- a single debug directory is created per script invocation, asserts failing with no directory will no longer occur
- torchinductor debug tracing will correctly dump to the debug directory now since no prior setup is needed, (the directory was incorrectly only initialized during dynamo tracing)
cc @jansel @lezcano @fdrocha @soumith @voznesenskym @yanboliang @penguinwu @anijain2305
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87682
Approved by: https://github.com/ezyang
