[llvm] [VPlan] Dispatch to multiple exit blocks via middle blocks. (PR #112138)

[via llvm-commits]

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@@ -1820,6 +1820,57 @@ void VPlanTransforms::createInterleaveGroups(
   }
 }
 
+void VPlanTransforms::handleUncountableEarlyExit(
+    VPlan &Plan, ScalarEvolution &SE, Loop *OrigLoop,
+    BasicBlock *UncountableExitingBlock, VPRecipeBuilder &RecipeBuilder) {
+  auto *LatchVPBB =
+      cast<VPBasicBlock>(Plan.getVectorLoopRegion()->getExiting());
+  VPBuilder Builder(LatchVPBB->getTerminator());
+  auto *MiddleVPBB = Plan.getMiddleBlock();
+  VPRegionBlock *LoopRegion = Plan.getVectorLoopRegion();
----------------
ayalz wrote:

```suggestion
  VPRegionBlock *LoopRegion = Plan.getVectorLoopRegion();
  auto *LatchVPBB = cast<VPBasicBlock>(LoopRegion->getExiting());
  VPBuilder Builder(LatchVPBB->getTerminator());
  auto *MiddleVPBB = Plan.getMiddleBlock();
```

https://github.com/llvm/llvm-project/pull/112138