[llvm] [VPlan] Compute interleave count for VPlan. (PR #149702)

[via llvm-commits]

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@@ -486,6 +486,13 @@ class LoopVectorizationPlanner {
   /// all profitable VFs in ProfitableVFs.
   VectorizationFactor computeBestVF();
 
+  /// \return The desired interleave count.
+  /// If interleave count has been specified by metadata it will be returned.
+  /// Otherwise, the interleave count is computed and returned. VF and LoopCost
+  /// are the selected vectorization factor and the cost of the selected VF.
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ayalz wrote:

```suggestion
  /// are the selected vectorization factor and its cost.
```

https://github.com/llvm/llvm-project/pull/149702