Rollback trunk to 3.21.15.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 033fdab3dc6652534e76bd9d4fae19eebeb08289..b3704df698970eb140f939f5e2a759112ac26833 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -294,6 +294,21 @@ Handle<String> SubString(Handle<String> str,
 }
 
 
+Handle<JSObject> Copy(Handle<JSObject> obj) {
+  Isolate* isolate = obj->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     isolate->heap()->CopyJSObject(*obj), JSObject);
+}
+
+
+Handle<JSObject> DeepCopy(Handle<JSObject> obj) {
+  Isolate* isolate = obj->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     obj->DeepCopy(isolate),
+                     JSObject);
+}
+
+
 // Wrappers for scripts are kept alive and cached in weak global
 // handles referred from foreign objects held by the scripts as long as
 // they are used. When they are not used anymore, the garbage