Reland of [heap] Fix CompactionSpace test and move to unittests

src/heap/spaces.h

 // Copyright 2011 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.
 
 #ifndef V8_HEAP_SPACES_H_
 #define V8_HEAP_SPACES_H_
 
 #include <list>
 #include <memory>
 #include <unordered_set>
@@ skipping 789 matching lines @@
     available_in_free_list_.Increment(available);
   }
   void remove_available_in_free_list(size_t available) {
     DCHECK_LE(available, area_size());
     DCHECK_GE(available_in_free_list(), available);
     available_in_free_list_.Decrement(available);
   }
 
   size_t ShrinkToHighWaterMark();
 
-  void CreateBlackArea(Address start, Address end);
+  V8_EXPORT_PRIVATE void CreateBlackArea(Address start, Address end);
 
 #ifdef DEBUG
   void Print();
 #endif  // DEBUG
 
  private:
   enum InitializationMode { kFreeMemory, kDoNotFreeMemory };
 
   template <InitializationMode mode = kFreeMemory>
   static inline Page* Initialize(Heap* heap, MemoryChunk* chunk,
@@ skipping 1905 matching lines @@
   ~PauseAllocationObserversScope();
 
  private:
   Heap* heap_;
   DISALLOW_COPY_AND_ASSIGN(PauseAllocationObserversScope);
 };
 
 // -----------------------------------------------------------------------------
 // Compaction space that is used temporarily during compaction.
 
-class CompactionSpace : public PagedSpace {
+class V8_EXPORT_PRIVATE CompactionSpace : public PagedSpace {
  public:
   CompactionSpace(Heap* heap, AllocationSpace id, Executability executable)
       : PagedSpace(heap, id, executable) {}
 
   bool is_local() override { return true; }
 
  protected:
   // The space is temporary and not included in any snapshots.
   bool snapshotable() override { return false; }
 
@@ skipping 212 matching lines @@
   PageIterator old_iterator_;
   PageIterator code_iterator_;
   PageIterator map_iterator_;
   LargePageIterator lo_iterator_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SPACES_H_