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

[via llvm-commits]

================
@@ -45,6 +45,11 @@ target triple = "aarch64-unknown-linux-gnu"
 ; CHECK-NEXT: No successors
 ; CHECK-EMPTY:
 ; CHECK-NEXT: scalar.ph:
+; CHECK-NEXT: Successor(s): ir-bb<for.body>
+; CHECK-EMPTY:
+; CHECK-NEXT: ir-bb<for.body>:
----------------
ayalz wrote:

Now we have a full scalar header, earlier we had no live outs?

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