[llvm] [LV] Transform to handle exits in the scalar loop (PR #148626)

[Gaëtan Bossu via llvm-commits]

https://github.com/gbossu commented:

Some initial comments to help me understand how that change fits in the existing early-exit support. I'm yet to really dive into the different transforms that allow EE VPlans.

https://github.com/llvm/llvm-project/pull/148626