Merge cellspace into old 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 c6800993c00fabd5ac963a62e51b4d80a90ec28b..156e518d0edc07dbf680e92b608542b850c834e6 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -280,6 +280,7 @@ class SlotsBuffer {
   enum SlotType {
     EMBEDDED_OBJECT_SLOT,
     RELOCATED_CODE_OBJECT,
+    CELL_TARGET_SLOT,
     CODE_TARGET_SLOT,
     CODE_ENTRY_SLOT,
     DEBUG_TARGET_SLOT,
@@ -293,6 +294,8 @@ class SlotsBuffer {
         return "EMBEDDED_OBJECT_SLOT";
       case RELOCATED_CODE_OBJECT:
         return "RELOCATED_CODE_OBJECT";
+      case CELL_TARGET_SLOT:
+        return "CELL_TARGET_SLOT";
       case CODE_TARGET_SLOT:
         return "CODE_TARGET_SLOT";
       case CODE_ENTRY_SLOT: