Attempt to collect more garbage before panicking with out of memory.

src/global-handles.h

Index: src/global-handles.h
diff --git a/src/global-handles.h b/src/global-handles.h
index 659f86eca70251687a009c585e4d59936e731edd..37b2b44522e55ea628a433f8546b5a5fd6e8da74 100644
--- a/src/global-handles.h
+++ b/src/global-handles.h
@@ -96,7 +96,8 @@ class GlobalHandles : public AllStatic {
   static bool IsWeak(Object** location);
 
   // Process pending weak handles.
-  static void PostGarbageCollectionProcessing();
+  // Returns true if next major GC is likely to collect more garbage.
+  static bool PostGarbageCollectionProcessing();
 
   // Iterates over all strong handles.
   static void IterateStrongRoots(ObjectVisitor* v);