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

test/unittests/compiler/js-builtin-reducer-unittest.cc

 // 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.
 
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/typer.h"
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/compiler/node-test-utils.h"
@@ skipping 23 matching lines @@
 
   Node* MathFunction(const char* name) {
     Handle<Object> m =
         JSObject::GetProperty(isolate()->global_object(),
                               isolate()->factory()->NewStringFromAsciiChecked(
                                   "Math")).ToHandleChecked();
     Handle<JSFunction> f = Handle<JSFunction>::cast(
         JSObject::GetProperty(
             m, isolate()->factory()->NewStringFromAsciiChecked(name))
             .ToHandleChecked());
-    return HeapConstant(Unique<JSFunction>::CreateUninitialized(f));
+    return HeapConstant(f);
   }
 
   JSOperatorBuilder* javascript() { return &javascript_; }
 
  private:
   JSOperatorBuilder javascript_;
 };
 
 
 namespace {
@@ skipping 140 matching lines @@
 
       ASSERT_TRUE(r.Changed());
       EXPECT_THAT(r.replacement(), IsTruncateFloat64ToFloat32(p0));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8