Use the old handler for low frequency idle notifications.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 4feb70eb412d8558fc15c8f88116fa3c8f984df6..e96a87d7eb055e7ef7ed0c9bddfb5c0073870854 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -4541,9 +4541,10 @@ void Heap::EnsureHeapIsIterable() {
 
 
 bool Heap::IdleNotification(int hint) {
+  if (hint >= 1000) return IdleGlobalGC();
   if (contexts_disposed_ > 0 || !FLAG_incremental_marking ||
       FLAG_expose_gc || Serializer::enabled()) {
-    return hint < 1000 ? true : IdleGlobalGC();
+    return true;
   }
 
   // By doing small chunks of GC work in each IdleNotification,