Fix clearing of dead dependent codes and verify weak embedded maps on full GC.

src/lithium.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 434 matching lines @@
   for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
     RelocInfo::Mode mode = it.rinfo()->rmode();
     if (mode == RelocInfo::EMBEDDED_OBJECT &&
         it.rinfo()->target_object()->IsMap()) {
       Handle<Map> map(Map::cast(it.rinfo()->target_object()));
       if (map->CanTransition()) {
         maps.Add(map, zone());
       }
     }
   }
+#ifdef VERIFY_HEAP
+  // This disables verification of weak embedded maps after full GC.
+  // AddDependentCode can cause a GC, which would observe the state where
+  // this code is not yet in the depended code lists of the embedded maps.
+  NoWeakEmbeddedMapsVerificationScope disable_verification_of_embedded_maps;
+#endif
   for (int i = 0; i < maps.length(); i++) {
     maps.at(i)->AddDependentCode(code);
   }
 }
 
 } }  // namespace v8::internal