[llvm] [VPlan] Introduce explicit ExtractFromEnd recipes for live-outs. (PR #100658)

[via llvm-commits]

================
@@ -8459,6 +8459,16 @@ static void addUsersInExitBlock(
   if (!ExitBB || !ExitBB->getSinglePredecessor() || !ExitingBB)
     return;
 
+  auto MiddleVPBB =
+      cast<VPBasicBlock>(Plan.getVectorLoopRegion()->getSingleSuccessor());
+  VPBuilder B(MiddleVPBB);
----------------
ayalz wrote:

```suggestion
  VPBuilder B(MiddleVPBB);
  // TODO: set B to MiddleVPBB->getFirstNonPhi(), taking care of affected tests.
```


https://github.com/llvm/llvm-project/pull/100658