Collect phantom callback data only once during gc. For scavenges, just consider the young handles r…

src/global-handles.cc

Index: src/global-handles.cc
diff --git a/src/global-handles.cc b/src/global-handles.cc
index 4048416ca69d35e34c8baea850823826ddc55848..277cad6c3c0b2961cf6c3f39cf21b0c481523923 100644
--- a/src/global-handles.cc
+++ b/src/global-handles.cc
@@ -573,7 +573,7 @@ void GlobalHandles::MakePhantom(Object** location, void* parameter,
 }
 
 
-void GlobalHandles::CollectPhantomCallbackData() {
+void GlobalHandles::CollectAllPhantomCallbackData() {
   for (NodeIterator it(this); !it.done(); it.Advance()) {
     Node* node = it.node();
     node->CollectPhantomCallbackData(isolate(), &pending_phantom_callbacks_);
@@ -581,6 +581,15 @@ void GlobalHandles::CollectPhantomCallbackData() {
 }
 
 
+void GlobalHandles::CollectYoungPhantomCallbackData() {
+  for (int i = 0; i < new_space_nodes_.length(); ++i) {
+    Node* node = new_space_nodes_[i];
+    DCHECK(node->is_in_new_space_list());
+    node->CollectPhantomCallbackData(isolate(), &pending_phantom_callbacks_);
+  }
+}
+
+
 void* GlobalHandles::ClearWeakness(Object** location) {
   return Node::FromLocation(location)->ClearWeakness();
 }