[cctest] Move most heap related tests to test/cctest/heap and clean wrt IWYU

test/cctest/heap/test-incremental-marking.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.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <stdlib.h>
 
 #ifdef __linux__
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 #endif
 
 #include <utility>
 
 #include "src/v8.h"
 
 #include "src/full-codegen/full-codegen.h"
 #include "src/global-handles.h"
 #include "test/cctest/cctest.h"
+#include "test/cctest/heap/utils-inl.h"
+
 
 using v8::IdleTask;
 using v8::Task;
 using v8::Isolate;
 
 namespace v8 {
 namespace internal {
 
 class MockPlatform : public v8::Platform {
  public:
@@ skipping 133 matching lines @@
   while (!marking->IsStopped() && platform.PendingDelayedTask()) {
     platform.PerformDelayedTask();
   }
   // There could be pending delayed task from memory reducer after GC finishes.
   CHECK(marking->IsStopped());
   i::V8::SetPlatformForTesting(old_platform);
 }
 
 }  // namespace internal
 }  // namespace v8