Verify that code stubs and full code do not have pointers that can retain

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index d1e5acff893d65b008606969db7241a873602656..c71dd9f3ef461ab43d5e355a5e888017a08f607c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5401,7 +5401,8 @@ class Code: public HeapObject {
 #endif
 
 #ifdef DEBUG
-  void VerifyEmbeddedObjectsInFullCode();
+  enum VerifyMode { kNoContextSpecificPointers, kNoContextRetainingPointers };
+  void VerifyEmbeddedObjects(VerifyMode mode = kNoContextRetainingPointers);
 #endif  // DEBUG
 
   inline bool CanContainWeakObjects() {