ec14a1f40c
Add a new cost-based transform that replaces VPWidenCanonicalIVRecipe with a canonical VPWidenIntOrFpInductionPHIRecipe, if it does not increase spills. The main benefit of VPWidenCanonicalIVRecipe is that it has shorter live-ranges than wide IV phis. The new transform introduces wide IV unless VPWidenCanonicalIVRecipe is cheaper or the wide IV introduces additional spills. This introduces wide IVs in a number of cases, where previously had VPWidenCanonicalIVRecipe, because there was no existing wide canonical IV we could re-use. It should also help avoid somewhat unrelated changes in https://github.com/llvm/llvm-project/pull/190191. PR: https://github.com/llvm/llvm-project/pull/194267