Improve matmul fuse

[nathanielsimard]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 76.47059% with 12 lines in your changes missing coverage. Please review.

Project coverage is 81.66%. Comparing base (1962fb1) to head (25e5c83).

Files with missing lines	Patch %	Lines
crates/burn-jit/src/fusion/on_write/ir.rs	26.66%	11 Missing ⚠️
...urn-jit/src/fusion/on_write/trace/vectorization.rs	94.11%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (76.47%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2805      +/-   ##
==========================================
- Coverage   81.66%   81.66%   -0.01%     
==========================================
  Files         851      851              
  Lines      113413   113458      +45     
==========================================
+ Hits        92620    92654      +34     
- Misses      20793    20804      +11     

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