[llvm] [SLP]Add cost estimation for gather node reshuffling (PR #115201)

[Alexey Bataev via llvm-commits]

================
@@ -10296,10 +10296,10 @@ class BoUpSLP::ShuffleCostEstimator : public BaseShuffleAnalysis {
             Idx = EMask[Idx];
         }
         CommonVF = E->Scalars.size();
-      } else if (std::optional<unsigned> Factor = E->getInterleaveFactor();
----------------
alexey-bataev wrote:

Done

https://github.com/llvm/llvm-project/pull/115201