[llvm] [VPlan] Replace EVL branch condition with (branch-on-count AVLNext, 0) (PR #152167)

[Luke Lau via llvm-commits]

lukel97 wrote:

Gentle ping, cc @arcbbb the PR has been refactored since the last time you reviewed it so would appreciate a second look if you have the time :)

https://github.com/llvm/llvm-project/pull/152167