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

test/unittests/compiler/interpreter-assembler-unittest.cc

 // 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.
 
 #include "test/unittests/compiler/interpreter-assembler-unittest.h"
 
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
 #include "src/unique.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
@@ skipping 136 matching lines @@
     InterpreterAssemblerForTest m(this, bytecode);
     m.Return();
     Graph* graph = m.GetCompletedGraph();
 
     Node* end = graph->end();
     EXPECT_EQ(1, end->InputCount());
     Node* tail_call_node = end->InputAt(0);
 
     EXPECT_EQ(CallDescriptor::kCallCodeObject, m.call_descriptor()->kind());
     EXPECT_TRUE(m.call_descriptor()->flags() & CallDescriptor::kCanUseRoots);
-    Matcher<Unique<HeapObject>> exit_trampoline(
-        Unique<HeapObject>::CreateImmovable(
-            isolate()->builtins()->InterpreterExitTrampoline()));
+    Handle<HeapObject> exit_trampoline =
+        isolate()->builtins()->InterpreterExitTrampoline();
     EXPECT_THAT(
         tail_call_node,
         IsTailCall(m.call_descriptor(), IsHeapConstant(exit_trampoline),
                    IsParameter(Linkage::kInterpreterAccumulatorParameter),
                    IsParameter(Linkage::kInterpreterRegisterFileParameter),
                    IsParameter(Linkage::kInterpreterBytecodeOffsetParameter),
                    IsParameter(Linkage::kInterpreterBytecodeArrayParameter),
                    IsParameter(Linkage::kInterpreterDispatchTableParameter),
                    IsParameter(Linkage::kInterpreterContextParameter),
                    graph->start(), graph->start()));
@@ skipping 178 matching lines @@
         m.CallJSBuiltin(Context::SUB_BUILTIN_INDEX, receiver, arg1);
     EXPECT_THAT(call_js_builtin_1,
                 IsCall(_, function_matcher, receiver, arg1, context_matcher,
                        m.graph()->start(), m.graph()->start()));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8