Handle negative padding in reflect_pad_backward

[ngimel]

Fixes #100793

cc @soumith @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @Xia-Weiwen @wenzhe-nrv @jiayisunx @peterbell10 @desertfire

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/100923

• 📄 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 or our office hours

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:

• GitHub May 9th outage

❌ 1 New Failure

As of commit 6afa6e4:

NEW FAILURE - The following job has failed:

• linux-focal-cpu-py3.8-gcc7-inductor / test (inductor_huggingface_cpu_accuracy, 1, 1, linux.4xlarge) (gh)

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

[ngimel]

@pytorchbot merge -f "test failure unrelated"

[pytorchmergebot]

Merge started

Your change will be merged immediately since you used the force (-f) flag, bypassing any CI checks (ETA: 1-5 minutes).

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