Fix release build. Add comment accidentally omitted from

src/spaces-inl.h

 // Copyright 2011 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 278 matching lines @@
 }
 
 
 // -----------------------------------------------------------------------------
 // NewSpace
 
 
 MaybeObject* NewSpace::AllocateRaw(int size_in_bytes) {
   Address old_top = allocation_info_.top;
 #ifdef DEBUG
+  // If we are stressing compaction we waste some memory in new space
+  // in order to get more frequent GCs.
   if (FLAG_stress_compaction && !HEAP->linear_allocation()) {
     if (allocation_info_.limit - old_top >= size_in_bytes * 4) {
       int filler_size = size_in_bytes * 4;
       for (int i = 0; i < filler_size; i += kPointerSize) {
         *(reinterpret_cast<Object**>(old_top + i)) =
             HEAP->one_pointer_filler_map();
       }
       old_top += filler_size;
       allocation_info_.top += filler_size;
     }
@@ skipping 44 matching lines @@
   Map* map = object->map();
   Heap* heap = object->GetHeap();
   return map == heap->raw_unchecked_free_space_map()
       || map == heap->raw_unchecked_one_pointer_filler_map()
       || map == heap->raw_unchecked_two_pointer_filler_map();
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_INL_H_