Move some heap verification code in under the --verify-heap flag to speed

src/spaces.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 1114 matching lines @@
   // Slow path of next(), goes into the next page.  Returns false if the
   // iteration has ended.
   bool AdvanceToNextPage();
 
   // Initializes fields.
   inline void Initialize(PagedSpace* owner,
                          Address start,
                          Address end,
                          PageMode mode,
                          HeapObjectCallback size_func);
-
-#ifdef DEBUG
-  // Verifies whether fields have valid values.
-  void Verify();
-#endif
 };
 
 
 // -----------------------------------------------------------------------------
 // A PageIterator iterates the pages in a paged space.
 
 class PageIterator BASE_EMBEDDED {
  public:
   explicit inline PageIterator(PagedSpace* space);
 
@@ skipping 1465 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_