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

test/cctest/compiler/value-helper.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_CCTEST_COMPILER_VALUE_HELPER_H_
 #define V8_CCTEST_COMPILER_VALUE_HELPER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/common-operator.h"
@@ skipping 29 matching lines @@
   void CheckInt32Constant(int32_t expected, Node* node) {
     CHECK_EQ(IrOpcode::kInt32Constant, node->opcode());
     CHECK_EQ(expected, OpParameter<int32_t>(node));
   }
 
   void CheckUint32Constant(int32_t expected, Node* node) {
     CHECK_EQ(IrOpcode::kInt32Constant, node->opcode());
     CHECK_EQ(expected, OpParameter<int32_t>(node));
   }
 
-  void CheckHeapConstant(Object* expected, Node* node) {
+  void CheckHeapConstant(HeapObject* expected, Node* node) {
     CHECK_EQ(IrOpcode::kHeapConstant, node->opcode());
-    CHECK_EQ(expected, *OpParameter<Unique<Object> >(node).handle());
+    CHECK_EQ(expected, *OpParameter<Handle<HeapObject>>(node));
   }
 
   void CheckTrue(Node* node) {
     CheckHeapConstant(isolate_->heap()->true_value(), node);
   }
 
   void CheckFalse(Node* node) {
     CheckHeapConstant(isolate_->heap()->false_value(), node);
   }
 
@@ skipping 98 matching lines @@
 
 #define FOR_INT32_SHIFTS(var) for (int32_t var = 0; var < 32; var++)
 
 #define FOR_UINT32_SHIFTS(var) for (uint32_t var = 0; var < 32; var++)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_VALUE_HELPER_H_