[turbofan] Remove dead code from Diamond class.

src/compiler/diamond.h

 // Copyright 2013 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_DIAMOND_H_
 #define V8_COMPILER_DIAMOND_H_
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
-#include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // A helper to make it easier to build diamond-shaped control patterns.
 struct Diamond {
   Graph* graph;
   CommonOperatorBuilder* common;
   Node* branch;
@@ skipping 28 matching lines @@
     }
   }
 
   Node* Phi(MachineType machine_type, Node* tv, Node* fv) {
     return graph->NewNode(common->Phi(machine_type, 2), tv, fv, merge);
   }
 
   Node* EffectPhi(Node* tv, Node* fv) {
     return graph->NewNode(common->EffectPhi(2), tv, fv, merge);
   }
+};
 
-  void OverwriteWithPhi(Node* node, MachineType machine_type, Node* tv,
-                        Node* fv) {
-    DCHECK(node->InputCount() >= 3);
-    node->ReplaceInput(0, tv);
-    node->ReplaceInput(1, fv);
-    node->ReplaceInput(2, merge);
-    node->TrimInputCount(3);
-    NodeProperties::ChangeOp(node, common->Phi(machine_type, 2));
-  }
-
-  void OverwriteWithEffectPhi(Node* node, Node* te, Node* fe) {
-    DCHECK(node->InputCount() >= 3);
-    node->ReplaceInput(0, te);
-    node->ReplaceInput(1, fe);
-    node->ReplaceInput(2, merge);
-    node->TrimInputCount(3);
-    NodeProperties::ChangeOp(node, common->EffectPhi(2));
-  }
-};
-}
-}
-}  // namespace v8::internal::compiler
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_COMPILER_DIAMOND_H_