[llvm-branch-commits] [llvm] release/20.x: Revert "[SLP] getSpillCost - fully populate IntrinsicCostAttributes to improve cost analysis." (#124962) (PR #126487)

[Luke Lau via llvm-branch-commits]

https://github.com/lukel97 approved this pull request.

Thanks for fixing the cherry-pick. Re: #124499, I couldn't think of a simple fix we could apply on top of e3fbf19eb4428cac03c0e7301512f11f8947d743 for the 20.x release branch.

I think it's best if we cherry-pick the revert so that performance isn't impacted on 20.x, and just continue to fix the cost model stuff in-tree for 21.x.

https://github.com/llvm/llvm-project/pull/126487