[llvm] [VPlan] Use BlockFrequencyInfo in getPredBlockCostDivisor (PR #158690)

[Florian Hahn via llvm-commits]

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@@ -10265,9 +10272,7 @@ PreservedAnalyses LoopVectorizePass::run(Function &F,
 
   auto &MAMProxy = AM.getResult<ModuleAnalysisManagerFunctionProxy>(F);
   PSI = MAMProxy.getCachedResult<ProfileSummaryAnalysis>(*F.getParent());
-  BFI = nullptr;
-  if (PSI && PSI->hasProfileSummary())
-    BFI = &AM.getResult<BlockFrequencyAnalysis>(F);
+  BFI = &AM.getResult<BlockFrequencyAnalysis>(F);
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fhahn wrote:

Now that we are unconditionally request BFI, could we preserve it? Not sure how expensive it is to re-compute from scratch.

https://github.com/llvm/llvm-project/pull/158690