Revert of Merge cellspace into old pointer space

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index e5e8235c292a15049f7afffd4ca0d0b9b9eb85fb..8d45d12b5457691dac0a49a4708bc9c91f852430 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1896,7 +1896,17 @@
 }
 
 
-ACCESSORS(Cell, value, Object, kValueOffset)
+Object* Cell::value() const {
+  return READ_FIELD(this, kValueOffset);
+}
+
+
+void Cell::set_value(Object* val, WriteBarrierMode ignored) {
+  // The write barrier is not used for global property cells.
+  DCHECK(!val->IsPropertyCell() && !val->IsCell());
+  WRITE_FIELD(this, kValueOffset, val);
+}
+
 ACCESSORS(PropertyCell, dependent_code, DependentCode, kDependentCodeOffset)
 ACCESSORS(PropertyCell, value, Object, kValueOffset)