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

[via llvm-commits]

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@@ -1838,3 +1838,54 @@ void VPlanTransforms::convertToConcreteRecipes(VPlan &Plan) {
     }
   }
 }
+
+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();
+  VPValue *EarlyExitTaken = nullptr;
----------------
ayalz wrote:

```suggestion
  VPValue *IsEarlyExitTaken = nullptr;
```
more consistent with `IsLatchExiting` below. 

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