[llvm] [VPlan] Introduce scalar loop header in plan, remove VPLiveOut. (PR #109975)

[via llvm-commits]

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@@ -3642,22 +3598,26 @@ class VPlan {
   /// and \p Entry to the plan. At the moment, \p Preheader and \p Entry need to
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ayalz wrote:

Augment documentation with additional \p.

https://github.com/llvm/llvm-project/pull/109975