[dynamo] Fix ListIterator tracking mutations to original list

[rtimpe]

Stack from ghstack (oldest at bottom):

• -> [dynamo] Fix ListIterator tracking mutations to original list #166350
• [dynamo] Implement iter with a polyfill #162768
• [dynamo] Add __iter__ for iterable VariableTrackers #166349

Currently ListIteratorVariable copies the underlying list, which prevents it
from seeing mutations to the original list. Remove the copy to match cpython behavior.

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @chenyang78 @kadeng @chauhang @amjames @Lucaskabela

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/166350

• 📄 Preview Python docs built from this PR
• 📄 Preview C++ docs built from this PR
• ❓ Need help or want to give feedback on the CI? Visit the bot commands wiki

Note: Links to docs will display an error until the docs builds have been completed.

❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• Long queue for ROCM runners, also B200 and XPU queueing is observed

✅ No Failures

As of commit 9632eaa with merge base 9901d44 ():
💚 Looks good so far! There are no failures yet. 💚

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[rtimpe]

@pytorchbot merge

[pytorchmergebot]

Merge started

Your change will be merged once all checks pass (ETA 0-4 Hours).

Learn more about merging in the wiki.

Questions? Feedback? Please reach out to the PyTorch DevX Team

Advanced Debugging

Check the merge workflow status
here