Set lower allocation limit in idle notification only if no GC happend recently.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 8c1b459e0866a682ac5f9af160bcf0c20426ab3a..a9d7a4729311f83d4f99475f9f1df2fd78bdd084 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -2129,15 +2129,18 @@ class Heap {
   // Minimal interval between two subsequent collections.
   double min_in_mutator_;
 
-  // Cumulative GC time spent in marking
+  // Cumulative GC time spent in marking.
   double marking_time_;
 
-  // Cumulative GC time spent in sweeping
+  // Cumulative GC time spent in sweeping.
   double sweeping_time_;
 
-  // Last time an idle notification happened
+  // Last time an idle notification happened.
   double last_idle_notification_time_;
 
+  // Last time a garbage collection happened.
+  double last_gc_time_;
+
   MarkCompactCollector mark_compact_collector_;
 
   StoreBuffer store_buffer_;