[CI] Fix failed CI step "PyTorch Compilation Unit Tests"

[SoluMilken]

Purpose

Fix 41958.

Test Plan

python -m pytest tests/compile/test_aot_compile.py

Test Result

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

[gemini-code-assist]

Code Review

This pull request improves error reporting for test subprocesses by including both stdout and stderr in the failure message and using robust decoding to handle potential encoding issues. Additionally, it initializes a new dictionary, var_to_hint_override, in the AlwaysHitShapeEnv class. Feedback was provided to eliminate redundant output in the error message when a traceback file is missing by using a placeholder instead of duplicating the stderr content.

[claude]

Claude Code Review

This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

[SoluMilken]

Hi @ProExpertProg,

I saw you just reviewed/approved another CI fix PR. Could you help me take a quick look at this one as well? I'm trying to fix the "PyTorch Compilation Unit Tests" CI failure and would appreciate your guidance to get it passing. Thanks!

[SoluMilken]

The issue has been fixed by this PR #41940.
Let me close this PR and this issue #41958.