[llvm] [VPlan] Manage noalias/alias_scope metadata in VPlan. (NFC) (PR #136450)

[Ramkumar Ramachandra via llvm-commits]

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@@ -9131,10 +9129,22 @@ void LoopVectorizationPlanner::buildVPlansWithVPRecipes(ElementCount MinVF,
                                                         ElementCount MaxVF) {
   assert(OrigLoop->isInnermost() && "Inner loop expected.");
 
+  // Only use noalias metadata when using memory checks guaranteeing no overlap
+  // across all iterations.
+  const LoopAccessInfo *LAI = Legal->getLAI();
+  std::unique_ptr<LoopVersioning> LVer = nullptr;
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artagnon wrote:

Can this be moved to Legal to avoid the unique_ptr? Probably not worth it if it's too much work.

https://github.com/llvm/llvm-project/pull/136450