[llvm] [LV] Header masked condition of FindLastSelect when optimizeFindIVReductions when folding tail. (PR #191166)

[Andrei Elovikov via llvm-commits]

eas wrote:

Wouldn't @lukel97 's https://github.com/llvm/llvm-project/compare/main...lukel97:llvm-project:loop-vectorize/move-tailfolding-reductionphis be a better fix? Or am I misunderstanding the issue?

https://github.com/llvm/llvm-project/pull/191166