Fix/reduce out of bounds

[nathanielsimard]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (5a74fc1) to head (d85d51d).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...ates/burn-cubecl-fusion/src/reduce/optimization.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2906      +/-   ##
==========================================
- Coverage   82.32%   81.80%   -0.52%     
==========================================
  Files         867      875       +8     
  Lines      118525   120706    +2181     
==========================================
+ Hits        97570    98740    +1170     
- Misses      20955    21966    +1011     

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