[llvm] [VPlan] Delay adding canonical IV increment. (PR #82270)

[via llvm-commits]

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@@ -7674,6 +7674,17 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
 
   // TODO: Move to VPlan transform stage once the transition to the VPlan-based
   // cost model is complete for better cost estimates.
+  bool IVUpdateMayOverflow =
+      !isIndvarOverflowCheckKnownFalse(&CM, BestVF, BestUF);
+  TailFoldingStyle Style = CM.getTailFoldingStyle(IVUpdateMayOverflow);
+  bool WithoutRuntimeCheck =
+      Style == TailFoldingStyle::DataAndControlFlowWithoutRuntimeCheck;
+  // Use NUW for the induction increment if we proved that it won't overflow in
+  // the vector loop or when not folding the tail. In the later case, we know
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ayalz wrote:

```suggestion
  // the vector loop or when not folding the tail. In the latter case, we know
```

https://github.com/llvm/llvm-project/pull/82270