[turbofan] Turn common Guard operator into simplified TypeGuard.

src/compiler/load-elimination.h

 // Copyright 2014 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.
 
 #ifndef V8_COMPILER_LOAD_ELIMINATION_H_
 #define V8_COMPILER_LOAD_ELIMINATION_H_
 
 #include "src/compiler/graph-reducer.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
-class CommonOperatorBuilder;
 class Graph;
+class SimplifiedOperatorBuilder;
 
 class LoadElimination final : public AdvancedReducer {
  public:
   explicit LoadElimination(Editor* editor, Graph* graph,
-                           CommonOperatorBuilder* common)
-      : AdvancedReducer(editor), graph_(graph), common_(common) {}
+                           SimplifiedOperatorBuilder* simplified)
+      : AdvancedReducer(editor), graph_(graph), simplified_(simplified) {}
   ~LoadElimination() final;
 
   Reduction Reduce(Node* node) final;
 
  private:
-  CommonOperatorBuilder* common() const { return common_; }
-  Graph* graph() { return graph_; }
+  SimplifiedOperatorBuilder* simplified() const { return simplified_; }
+  Graph* graph() const { return graph_; }
 
   Reduction ReduceLoadField(Node* node);
-  Graph* graph_;
-  CommonOperatorBuilder* common_;
+
+  Graph* const graph_;
+  SimplifiedOperatorBuilder* const simplified_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LOAD_ELIMINATION_H_