[llvm] [VPlan] Pre-commit test for VPWidenCanonicalIVRecipe cost (NFC) (PR #195014)

[Madhur Amilkanthwar via llvm-commits]

madhur13490 wrote:

Please check the follow up change which changes the costing in cost model https://github.com/llvm/llvm-project/pull/195017. (I need to use stacked PR for this)

https://github.com/llvm/llvm-project/pull/195014