[heap] Do not wait for marking deque uncommit task on tear down.

test/cctest/heap/test-mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 51 matching lines @@
   }
 
   while (!s.IsEmpty()) {
     Address value = s.Pop()->address();
     current_address -= kPointerSize;
     CHECK_EQ(current_address, value);
   }
 
   CHECK_EQ(original_address, current_address);
   s.StopUsing();
+  CcTest::i_isolate()->cancelable_task_manager()->CancelAndWait();
   s.TearDown();
 }
 
 TEST(Promotion) {
   CcTest::InitializeVM();
   Isolate* isolate = CcTest::i_isolate();
   {
     v8::HandleScope sc(CcTest::isolate());
     Heap* heap = isolate->heap();
 
@@ skipping 394 matching lines @@
 
 
 TEST(RegressJoinThreadsOnIsolateDeinit) {
   intptr_t size_limit = ShortLivingIsolate() * 2;
   for (int i = 0; i < 10; i++) {
     CHECK_GT(size_limit, ShortLivingIsolate());
   }
 }
 
 #endif  // __linux__ and !USE_SIMULATOR