Some more instrumentation to narrow down Failure leaks.

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 597 matching lines @@
   bool has_scheduled_exception() {
     return thread_local_top_.scheduled_exception_ != heap_.the_hole_value();
   }
   void clear_scheduled_exception() {
     thread_local_top_.scheduled_exception_ = heap_.the_hole_value();
   }
 
   bool IsExternallyCaught();
 
   bool is_catchable_by_javascript(MaybeObject* exception) {
-    return (exception != Failure::OutOfMemoryException()) &&
+    return (!exception->IsOutOfMemory()) &&
         (exception != heap()->termination_exception());
   }
 
   // Serializer.
   void PushToPartialSnapshotCache(Object* obj);
 
   // JS execution stack (see frames.h).
   static Address c_entry_fp(ThreadLocalTop* thread) {
     return thread->c_entry_fp_;
   }
@@ skipping 814 matching lines @@
 
 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_