Revert of Merge cellspace into old pointer space

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 40451413e9ca852923eb7c534add2ff82953ea74..1990c0e4b9c8a4e6b02451c9d32154443165152f 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -643,6 +643,7 @@
   OldSpace* old_space() { return old_space_; }
   OldSpace* code_space() { return code_space_; }
   MapSpace* map_space() { return map_space_; }
+  CellSpace* cell_space() { return cell_space_; }
   LargeObjectSpace* lo_space() { return lo_space_; }
   PagedSpace* paged_space(int idx) {
     switch (idx) {
@@ -650,6 +651,8 @@
         return old_space();
       case MAP_SPACE:
         return map_space();
+      case CELL_SPACE:
+        return cell_space();
       case CODE_SPACE:
         return code_space();
       case NEW_SPACE:
@@ -1568,6 +1571,7 @@
   OldSpace* old_space_;
   OldSpace* code_space_;
   MapSpace* map_space_;
+  CellSpace* cell_space_;
   LargeObjectSpace* lo_space_;
   HeapState gc_state_;
   int gc_post_processing_depth_;
@@ -2172,18 +2176,20 @@
   intptr_t* code_space_capacity;           //  6
   intptr_t* map_space_size;                //  7
   intptr_t* map_space_capacity;            //  8
-  intptr_t* lo_space_size;                 //  9
-  int* global_handle_count;                // 10
-  int* weak_global_handle_count;           // 11
-  int* pending_global_handle_count;        // 12
-  int* near_death_global_handle_count;     // 13
-  int* free_global_handle_count;           // 14
-  intptr_t* memory_allocator_size;         // 15
-  intptr_t* memory_allocator_capacity;     // 16
-  int* objects_per_type;                   // 17
-  int* size_per_type;                      // 18
-  int* os_error;                           // 19
-  int* end_marker;                         // 20
+  intptr_t* cell_space_size;               //  9
+  intptr_t* cell_space_capacity;           // 10
+  intptr_t* lo_space_size;                 // 11
+  int* global_handle_count;                // 12
+  int* weak_global_handle_count;           // 13
+  int* pending_global_handle_count;        // 14
+  int* near_death_global_handle_count;     // 15
+  int* free_global_handle_count;           // 16
+  intptr_t* memory_allocator_size;         // 17
+  intptr_t* memory_allocator_capacity;     // 18
+  int* objects_per_type;                   // 19
+  int* size_per_type;                      // 20
+  int* os_error;                           // 21
+  int* end_marker;                         // 22
 };