[turbofan] Remove usage of Unique<T> from graph.

src/compiler/representation-change.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_REPRESENTATION_CHANGE_H_
 #define V8_COMPILER_REPRESENTATION_CHANGE_H_
 
 #include <sstream>
 
 #include "src/base/bits.h"
@@ skipping 274 matching lines @@
     } else {
       return TypeError(node, output_type, kRepWord32);
     }
     return jsgraph()->graph()->NewNode(op, node);
   }
 
   Node* GetBitRepresentationFor(Node* node, MachineTypeUnion output_type) {
     // Eagerly fold representation changes for constants.
     switch (node->opcode()) {
       case IrOpcode::kHeapConstant: {
-        Handle<Object> value = OpParameter<Unique<Object> >(node).handle();
+        Handle<HeapObject> value = OpParameter<Handle<HeapObject>>(node);
         DCHECK(value.is_identical_to(factory()->true_value()) ||
                value.is_identical_to(factory()->false_value()));
         return jsgraph()->Int32Constant(
             value.is_identical_to(factory()->true_value()) ? 1 : 0);
       }
       default:
         break;
     }
     // Select the correct X -> Bit operator.
     const Operator* op;
@@ skipping 147 matching lines @@
   Factory* factory() const { return isolate()->factory(); }
   SimplifiedOperatorBuilder* simplified() { return simplified_; }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_REPRESENTATION_CHANGE_H_