A64: Synchronize with r17104.

src/handles.h

Index: src/handles.h
diff --git a/src/handles.h b/src/handles.h
index 0f619d572e3e7f7b6ddee2929f4d3951cdeba339..c1400ed841c4f8d842ba4731ca0c27b6d7533658 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -177,7 +177,7 @@ class HandleScope {
   // Extend the handle scope making room for more handles.
   static internal::Object** Extend(Isolate* isolate);
 
-#ifdef ENABLE_EXTRA_CHECKS
+#ifdef ENABLE_HANDLE_ZAPPING
   // Zaps the handles in the half-open interval [start, end).
   static void ZapRange(Object** start, Object** end);
 #endif
@@ -321,6 +321,9 @@ Handle<ObjectHashTable> PutIntoObjectHashTable(Handle<ObjectHashTable> table,
                                                Handle<Object> key,
                                                Handle<Object> value);
 
+void AddWeakObjectToCodeDependency(Heap* heap,
+                                   Handle<Object> object,
+                                   Handle<Code> code);
 
 // Seal off the current HandleScope so that new handles can only be created
 // if a new HandleScope is entered.