[turbofan] Remove redundant 'virtual' from store elimination.

src/compiler/store-store-elimination.cc

Index: src/compiler/store-store-elimination.cc
diff --git a/src/compiler/store-store-elimination.cc b/src/compiler/store-store-elimination.cc
index 75c88f811f94948b0d6447c3a1eb6cf824d0a29b..7f2d0d96152d4f9cba552b7fea9c3ed9f828fcd3 100644
--- a/src/compiler/store-store-elimination.cc
+++ b/src/compiler/store-store-elimination.cc
@@ -139,7 +139,7 @@ class RedundantStoreFinder final {
 
   const ZoneSet<Node*>& to_remove_const() { return to_remove_; }
 
-  virtual void Visit(Node* node);
+  void Visit(Node* node);
 
  private:
   static bool IsEffectful(Node* node);