[llvm] [VPlan] Constant-fold ActiveLaneMask intrinsics (PR #208852)

[Florian Hahn via llvm-commits]

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@@ -300,15 +300,17 @@ ElementCount VFSelectionContext::getMaximizedVFForTarget(
   return MaxVF;
 }
 
+std::optional<unsigned> llvm::getMaxVScale(const Function &F) {
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fhahn wrote:

may also be worth documenting the difference and when either should be used (the variant taking TTI should only be used for cost estimates IIUC?)

https://github.com/llvm/llvm-project/pull/208852