[llvm] [VPlan] Implement VPlan-based unit-strideness speculation (PR #182595)

[Mel Chen via llvm-commits]

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@@ -917,5 +918,9 @@ bool LoopVectorizationPlanner::isCandidateForEpilogueVectorization(
   if (OrigLoop->getExitingBlock() != OrigLoop->getLoopLatch())
     return false;
 
+  // Not implemented yet.
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Mel-Chen wrote:

nit: // TODO: ...

https://github.com/llvm/llvm-project/pull/182595