[wasm] Managed<T> ensures T's lifetime does not leak past Isolate's

test/cctest/wasm/test-managed.cc

-// Copyright 2016 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 <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "src/wasm/managed.h"
-
-#include "src/objects-inl.h"
-#include "test/cctest/cctest.h"
-#include "test/common/wasm/test-signatures.h"
-
-using namespace v8::base;
-using namespace v8::internal;
-
-class DeleteRecorder {
- public:
-  explicit DeleteRecorder(bool* deleted) : deleted_(deleted) {
-    *deleted_ = false;
-  }
-  ~DeleteRecorder() { *deleted_ = true; }
-
- private:
-  bool* deleted_;
-};
-
-TEST(ManagedCollect) {
-  Isolate* isolate = CcTest::InitIsolateOnce();
-  bool deleted = false;
-  DeleteRecorder* d = new DeleteRecorder(&deleted);
-
-  {
-    HandleScope scope(isolate);
-    auto handle = Managed<DeleteRecorder>::New(isolate, d);
-    USE(handle);
-  }
-
-  CcTest::CollectAllAvailableGarbage();
-
-  CHECK(deleted);
-}
-
-TEST(ManagedCollectNoDelete) {
-  Isolate* isolate = CcTest::InitIsolateOnce();
-  bool deleted = false;
-  DeleteRecorder* d = new DeleteRecorder(&deleted);
-
-  {
-    HandleScope scope(isolate);
-    auto handle = Managed<DeleteRecorder>::New(isolate, d, false);
-    USE(handle);
-  }
-
-  CcTest::CollectAllAvailableGarbage();
-
-  CHECK(!deleted);
-  delete d;
-}