[mlir] [mlir][linalg] Support subtracting accumulation in partial reduction … (PR #214033)

[Andrzej Warzyński]

banach-space wrote:

> > Given the unusual length of the summary I feel that I should ask - did AI assist with this?
> 
> Oh definitely. There should be a "co-authored" trailer on the commit giving attribution. This is my first time looking at these files in LLVM. Claude identified the fix based on a regression I was seeing with the IREE compiler. I did my best to understand and simplify it (as you say, it tends to be overly verbose).

Please make sure to follow https://llvm.org/docs/AIToolPolicy.html. In particular, 
> Contributors are expected to be transparent and label contributions that contain substantial amounts of tool-generated content. Our policy on labelling is intended to facilitate reviews, and not to track which parts of LLVM are generated. Contributors should note tool usage in their pull request description, commit message, or wherever authorship is normally indicated for the work.

https://github.com/llvm/llvm-project/pull/214033