[llvm] [LV]Split store-load forward distance analysis from other checks (PR #121156)

[Florian Hahn via llvm-commits]

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@@ -406,6 +406,12 @@ class LoopVectorizationLegality {
     return hasUncountableEarlyExit() ? getUncountableEdge()->second : nullptr;
   }
 
+  /// Return safe power-of-2 number of elements, which do not prevent store-load
+  /// forwarding and safe to operate simultaneously.
+  std::optional<unsigned> getMaxStoreLoadForwardSafeVFPowerOf2() const {
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fhahn wrote:

VF is always a power of 2 for now, does it need to be in the name? 

https://github.com/llvm/llvm-project/pull/121156