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

src/compiler/store-store-elimination.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <iterator>
 
 #include "src/compiler/store-store-elimination.h"
 
 #include "src/compiler/all-nodes.h"
 #include "src/compiler/js-graph.h"
@@ skipping 121 matching lines @@
 namespace {
 
 class RedundantStoreFinder final {
  public:
   RedundantStoreFinder(JSGraph* js_graph, Zone* temp_zone);
 
   void Find();
 
   const ZoneSet<Node*>& to_remove_const() { return to_remove_; }
 
-  virtual void Visit(Node* node);
+  void Visit(Node* node);
 
  private:
   static bool IsEffectful(Node* node);
   void VisitEffectfulNode(Node* node);
   UnobservablesSet RecomputeUseIntersection(Node* node);
   UnobservablesSet RecomputeSet(Node* node, UnobservablesSet uses);
   static bool CannotObserveStoreField(Node* node);
   static bool CanObserveAnything(Node* node);
 
   void MarkForRevisit(Node* node);
@@ skipping 424 matching lines @@
   return !(*this == other);
 }
 
 bool UnobservableStore::operator<(const UnobservableStore other) const {
   return (id_ < other.id_) || (id_ == other.id_ && offset_ < other.offset_);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8