[llvm] [VPlan] Convert EVL loops to variable-length stepping after dissolution (PR #147222)

[Luke Lau via llvm-commits]

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@@ -2357,6 +2357,64 @@ bool VPlanTransforms::tryAddExplicitVectorLength(
   return true;
 }
 
+void VPlanTransforms::simplifyEVLIVs(VPlan &Plan) {
+  auto ConvertEVLPhi = [](VPlan &Plan, VPBasicBlock *Entry,
+                          VPEVLBasedIVPHIRecipe *EVLPhi) {
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lukel97 wrote:

I think we can remove Entry and just use `EVLPhi->getParent()`?

```suggestion
  auto ConvertEVLPhi = [](VPlan &Plan, VPEVLBasedIVPHIRecipe *EVLPhi) {
```

https://github.com/llvm/llvm-project/pull/147222