[llvm] [VPlan] Narrow truncates of an induction plus a constant offset (PR #226035)

[Ramkumar Ramachandra via llvm-commits]

================
@@ -5950,15 +5997,23 @@ void VPlanTransforms::narrowInductionTruncates(VPlan &Plan, VFRange &Range,
         continue;
 
       VPValue *Op = VPI.getOperand(0);
-      auto *WideIV = getOptimizableIVOf(Op, PSE);
+      auto IVAndStart = getOptimizableIVOf(Op, Plan, PSE);
+      VPWidenInductionRecipe *WideIV = IVAndStart.first;
+      VPValue *Start = IVAndStart.second;
----------------
artagnon wrote:

```suggestion
      VPWidenInductionRecipe *WideIV;
      VPValue *Start;
      std::tie(WideIV, Start) = getOptimizableIVOf(Op, Plan, PSE);
```

You're lambda-capturing it so auto won't work until we bump the C++ standard?

https://github.com/llvm/llvm-project/pull/226035