[llvm] [LV][NFC] Query UnrollVectorizedLoop before executing the plan (PR #208500)

[David Sherwood via llvm-commits]

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@@ -981,13 +981,14 @@ class LoopVectorizationPlanner {
   /// the average trip count and invocation weight of the original loop (\p
   /// OrigAverageTripCount and \p OrigLoopInvocationWeight respectively). They
   /// cannot be retrieved after the plan has been executed, as the original loop
-  /// may have been removed.
+  /// may have been removed. \p UnrollVectorizedLoop, whether the target wants
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david-arm wrote:

nit: `\p UnrollVectorizedLoop indicates whether `

https://github.com/llvm/llvm-project/pull/208500