transformations: New linalg-fuse-multiply-add pass

[n-io]

Introduces a new pass to fuse linalg.mul and linalg.add into linalg.generic with the functionality of an FMA op.

[n-io]

This is a replacement for #3344 @superlopuh @AntonLydike

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.09%. Comparing base (8c332bd) to head (b96b60e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3347   +/-   ##
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  Coverage   90.08%   90.09%           
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  Files         446      447    +1     
  Lines       56443    56494   +51     
  Branches     5427     5431    +4     
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+ Hits        50845    50896   +51     
  Misses       4163     4163           
  Partials     1435     1435           

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[superlopuh]

The code looks good, although my understanding is that linalg is not designed to be used in this way, and instead fuses after tiling. I wonder if there's a similar direction for you to look into, maybe for later.

[n-io]

It made sense in my mind to do this sort of op fusion before bufferization, though maybe it doesn't make a difference?