Fix early exit condition for LowMemoryNotification.

src/global-handles.cc

Index: src/global-handles.cc
diff --git a/src/global-handles.cc b/src/global-handles.cc
index c69b9e27be9209cdaf669b24d91fee2f2c308f12..5c65635d0f9f3c31f747656dee7ef4ac9bcbf20e 100644
--- a/src/global-handles.cc
+++ b/src/global-handles.cc
@@ -634,6 +634,11 @@ bool GlobalHandles::PostGarbageCollectionProcessing(
     for (int i = 0; i < new_space_nodes_.length(); ++i) {
       Node* node = new_space_nodes_[i];
       ASSERT(node->is_in_new_space_list());
+      if (!node->IsRetainer()) {
+        // Free nodes do not have weak callbacks. Do not use them to compute
+        // the next_gc_likely_to_collect_more.
+        continue;
+      }
       // Skip dependent handles. Their weak callbacks might expect to be
       // called between two global garbage collection callbacks which
       // are not called for minor collections.
@@ -656,6 +661,11 @@ bool GlobalHandles::PostGarbageCollectionProcessing(
     }
   } else {
     for (NodeIterator it(this); !it.done(); it.Advance()) {
+      if (!it.node()->IsRetainer()) {
+        // Free nodes do not have weak callbacks. Do not use them to compute
+        // the next_gc_likely_to_collect_more.
+        continue;
+      }
       it.node()->clear_partially_dependent();
       if (it.node()->PostGarbageCollectionProcessing(isolate_)) {
         if (initial_post_gc_processing_count != post_gc_processing_count_) {