Revert "Merge old data and pointer space."

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index 3680dcf1c6a5e8b5b498593b334a542a6373a47a..ddb993f5a2f676491e732da2a1a39cae26c48b59 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -603,7 +603,11 @@ class MarkCompactCollector {
     // to other evacuation candidates thus we have to
     // rescan the page after evacuation to discover and update all
     // pointers to evacuated objects.
-    page->SetFlag(Page::RESCAN_ON_EVACUATION);
+    if (page->owner()->identity() == OLD_DATA_SPACE) {
+      evacuation_candidates_.RemoveElement(page);
+    } else {
+      page->SetFlag(Page::RESCAN_ON_EVACUATION);
+    }
   }
 
   void RecordRelocSlot(RelocInfo* rinfo, Object* target);
@@ -903,7 +907,8 @@ class MarkCompactCollector {
   List<Page*> evacuation_candidates_;
   List<Code*> invalidated_code_;
 
-  SmartPointer<FreeList> free_list_old_space_;
+  SmartPointer<FreeList> free_list_old_data_space_;
+  SmartPointer<FreeList> free_list_old_pointer_space_;
 
   friend class Heap;
 };