Do not follow accessor map transitions when marking descriptor arrays.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 85a4a3b7060cbf57509a5a14055f2ebe1596a89a..aa6fe80e530bd19cb9dce977787ad884e33d70c0 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -645,6 +645,9 @@ class MarkCompactCollector {
 
   // Mark a Map and its DescriptorArray together, skipping transitions.
   void MarkMapContents(Map* map);
+  bool MarkUnmarked(Object* value);
+  bool MarkUnmarkedAndPush(Object* value);
+  void MarkAccessorPairSlot(AccessorPair* accessors, int offset);
   void MarkDescriptorArray(DescriptorArray* descriptors);
 
   // Mark the heap roots and all objects reachable from them.