Fix incorrect filenames in vllm_compile_cache.py

[zou3519]

Test Plan:

• I ran vllm serve meta-llama/Llama-3.2-1B-Instruct locally and verified that vllm_compile_cache.py's filenames look like the following:

/home/rzou/.cache/vllm/torch_compile_cache/a785fdbf18/rank_0_0/inductor_cache/w2/cw22szhsitonk3z4ek
x476g3hzaet3vy5qmsoewpx3kgbokhcob2.py')}

[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.

💬 Join our developer Slack at https://slack.vllm.ai to discuss your PR in #pr-reviews, coordinate on features in #feat- channels, or join special interest groups in #sig- channels.

Just a reminder: PRs would not trigger full CI run by default. Instead, it would only run fastcheck CI which starts running only a small and essential subset of CI tests to quickly catch errors. You can run other CI tests on top of those by going to your fastcheck build on Buildkite UI (linked in the PR checks section) and unblock them. If you do not have permission to unblock, ping simon-mo or khluu to add you in our Buildkite org.

Once the PR is approved and ready to go, your PR reviewer(s) can run CI to test the changes comprehensively before merging.

To run CI, PR reviewers can either: Add ready label to the PR or enable auto-merge.

🚀

[zou3519]

cc @youkaichao could you review this please?

[youkaichao]

thanks for the fix! i added the logic from pytorch 2.5, when file_path = inductor_compiled_graph.current_callable is not a function from closure, hoping it will be more robust.

[youkaichao]

@zou3519 looking forward to the interface from inductor to get the hash key and the final file path from pytorch, so that we don't need to hack it in the future!