[llvm] [VPlan] Add VPlan-based addMinIterCheck, replace ILV for non-epilogue. (PR #153643)

[Florian Hahn via llvm-commits]

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@@ -3507,8 +3508,19 @@ VPlanTransforms::expandSCEVs(VPlan &Plan, ScalarEvolution &SE) {
     ExpSCEV->replaceAllUsesWith(Exp);
     if (Plan.getTripCount() == ExpSCEV)
       Plan.resetTripCount(Exp);
+
+    InsertPt = std::next(ExpSCEV->getIterator());
     ExpSCEV->eraseFromParent();
   }
+  assert(none_of(*Entry, IsaPred<VPExpandSCEVRecipe>) &&
+         "VPExpandSCEVRecipes must be be at the beginning of the entry block, "
+         "after any VPIRInstructions");
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fhahn wrote:

VPIRPhi is a sub-class of VPIRInstruction.

After VPExpandSCEV, there should only by VPInstructions, added by this patch

https://github.com/llvm/llvm-project/pull/153643