Ensure the word after top is cleared in newspace if top < high.

src/heap-inl.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 470 matching lines @@
 }
 
 
 void Heap::ScavengePointer(HeapObject** p) {
   ScavengeObject(p, *p);
 }
 
 
 void Heap::UpdateAllocationSiteFeedback(HeapObject* object) {
   Heap* heap = object->GetHeap();
-  ASSERT(heap->InNewSpace(object));
+  ASSERT(heap->InFromSpace(object));
 
   if (!FLAG_allocation_site_pretenuring ||
       !AllocationSite::CanTrack(object->map()->instance_type())) return;
 
   // Either object is the last object in the from space, or there is another
   // object of at least word size (the header map word) following it, so
   // suffices to compare ptr and top here.
   Address ptr = object->address() + object->Size();
   Address top = heap->new_space()->FromSpacePageHigh();
   ASSERT(ptr == top || ptr + HeapObject::kHeaderSize <= top);
@@ skipping 331 matching lines @@
 #ifdef DEBUG
   Isolate* isolate = Isolate::Current();
   isolate->heap()->disallow_allocation_failure_ = old_state_;
 #endif
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_