Add epilogue lambda guards

[imShZh]

The guard manager in torch.compile not only includes RootGuardManager, but also contains epilogue lambda guards. Checkout this link for more details.

This PR adds the missing guards in depyf, and change some ambiguous variable name to prevent possible future mistakes.

[youkaichao]

thanks for the great fix!

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.69%. Comparing base (2ba8467) to head (9286d9c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
depyf/explain/utils.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   90.66%   90.69%   +0.03%     
==========================================
  Files          10       10              
  Lines        1542     1547       +5     
==========================================
+ Hits         1398     1403       +5     
  Misses        144      144              

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