Clean up weak objects in optimized code.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9f47f8f0721c478c10907636784ed856fc36753f..53c1cfac7462b0f32a93eba9642ad3b73e1a2dc1 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5248,6 +5248,7 @@ class Code: public HeapObject {
   inline bool is_compare_nil_ic_stub() { return kind() == COMPARE_NIL_IC; }
   inline bool is_to_boolean_ic_stub() { return kind() == TO_BOOLEAN_IC; }
   inline bool is_keyed_stub();
+  inline bool is_optimized_code() { return kind() == OPTIMIZED_FUNCTION; }
 
   inline void set_raw_kind_specific_flags1(int value);
   inline void set_raw_kind_specific_flags2(int value);
@@ -5503,7 +5504,11 @@ class Code: public HeapObject {
   void VerifyEmbeddedObjectsDependency();
 #endif
 
-  static bool IsWeakEmbeddedObject(Kind kind, Object* object);
+  inline bool IsWeakObject(Object* object) {
+    return is_optimized_code() && IsWeakObjectInOptimizedCode(object);
+  }
+
+  inline bool IsWeakObjectInOptimizedCode(Object* object);
 
   // Max loop nesting marker used to postpose OSR. We don't take loop
   // nesting that is deeper than 5 levels into account.