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

src/compiler/instruction-selector-impl.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_INSTRUCTION_SELECTOR_IMPL_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/linkage.h"
@@ skipping 165 matching lines @@
       case IrOpcode::kInt64Constant:
         return Constant(OpParameter<int64_t>(node));
       case IrOpcode::kFloat32Constant:
         return Constant(OpParameter<float>(node));
       case IrOpcode::kFloat64Constant:
       case IrOpcode::kNumberConstant:
         return Constant(OpParameter<double>(node));
       case IrOpcode::kExternalConstant:
         return Constant(OpParameter<ExternalReference>(node));
       case IrOpcode::kHeapConstant:
-        return Constant(OpParameter<Unique<HeapObject> >(node).handle());
+        return Constant(OpParameter<Handle<HeapObject>>(node));
       default:
         break;
     }
     UNREACHABLE();
     return Constant(static_cast<int32_t>(0));
   }
 
   UnallocatedOperand Define(Node* node, UnallocatedOperand operand) {
     DCHECK_NOT_NULL(node);
     DCHECK_EQ(operand.virtual_register(), GetVReg(node));
@@ skipping 179 matching lines @@
                : (frame_state_descriptor->GetTotalSize() +
                   1);  // Include deopt id.
   }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_