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

src/compiler/interpreter-assembler.h

 // Copyright 2015 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_INTERPRETER_ASSEMBLER_H_
 #define V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
@@ skipping 41 matching lines @@
   void SetAccumulator(Node* value);
 
   // Loads from and stores to the interpreter register file.
   Node* LoadRegister(Node* reg_index);
   Node* StoreRegister(Node* value, Node* reg_index);
 
   // Constants.
   Node* Int32Constant(int value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
-  Node* HeapConstant(Unique<HeapObject> object);
+  Node* HeapConstant(Handle<HeapObject> object);
 
   // Tag and untag Smi values.
   Node* SmiTag(Node* value);
   Node* SmiUntag(Node* value);
 
   // Load constant at |index| in the constant pool.
   Node* LoadConstantPoolEntry(Node* index);
 
   // Load a field from an object on the heap.
   Node* LoadObjectField(Node* object, int offset);
@@ skipping 63 matching lines @@
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_ASSEMBLER_H_