Revert of Merge cellspace into old pointer space

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 "src/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
@@ skipping 2639 matching lines @@
   }
 
   const int max_map_space_pages_;
 
  public:
   TRACK_MEMORY("MapSpace")
 };
 
 
 // -----------------------------------------------------------------------------
+// Old space for simple property cell objects
+
+class CellSpace : public PagedSpace {
+ public:
+  // Creates a property cell space object with a maximum capacity.
+  CellSpace(Heap* heap, intptr_t max_capacity, AllocationSpace id)
+      : PagedSpace(heap, max_capacity, id, NOT_EXECUTABLE) {}
+
+  virtual int RoundSizeDownToObjectAlignment(int size) {
+    if (base::bits::IsPowerOfTwo32(Cell::kSize)) {
+      return RoundDown(size, Cell::kSize);
+    } else {
+      return (size / Cell::kSize) * Cell::kSize;
+    }
+  }
+
+ protected:
+  virtual void VerifyObject(HeapObject* obj);
+
+ public:
+  TRACK_MEMORY("CellSpace")
+};
+
+
+// -----------------------------------------------------------------------------
 // Large objects ( > Page::kMaxHeapObjectSize ) are allocated and managed by
 // the large object space. A large object is allocated from OS heap with
 // extra padding bytes (Page::kPageSize + Page::kObjectStartOffset).
 // A large object always starts at Page::kObjectStartOffset to a page.
 // Large objects do not move during garbage collections.
 
 class LargeObjectSpace : public Space {
  public:
   LargeObjectSpace(Heap* heap, intptr_t max_capacity, AllocationSpace id);
   virtual ~LargeObjectSpace() {}
@@ skipping 165 matching lines @@
     count = 0;
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_SPACES_H_