[llvm] [VPlan] Model branch cond to enter scalar epilogue in VPlan. (PR #92651)

[via llvm-commits]

================
@@ -9006,6 +8956,9 @@ void LoopVectorizationPlanner::adjustRecipesForReductions(
     }
   }
   Builder.setInsertPoint(&*LatchVPBB->begin());
+  VPBasicBlock *MiddleVPBB =
+      cast<VPBasicBlock>(VectorLoopRegion->getSingleSuccessor());
+  VPBasicBlock::iterator IP = MiddleVPBB->getFirstNonPhi();
----------------
ayalz wrote:

Could (some of) this be pushed independently, earlier, to clarify change in insertion points, if any?

https://github.com/llvm/llvm-project/pull/92651