[DO NOT MERGE] Reintroduce "[SWP] attempt to remove a workaround for a triton llvm codegen bug (#4873)" #4973
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Please do not merge automatically, I will merge it by hand.
After investigation of the differences caused by #4774 in the internal tests, we concluded that they were introduced by change in the layouts selected for the reduce operations. Re-introducing that change, as it is functionally correct and should be beneficial for performance.