Allow assertions to be enabled in Blink Release builds.

Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 689 matching lines @@
         // before the next GC arrived.
         if (sweepRequested())
             heap->clearMarks();
     }
     setSweepRequested();
 }
 
 BaseHeapPage* ThreadState::heapPageFromAddress(Address address)
 {
     BaseHeapPage* cachedPage = heapContainsCache()->lookup(address);
-#ifdef NDEBUG
+#if !ENABLE(ASSERT)
     if (cachedPage)
         return cachedPage;
 #endif
 
     for (int i = 0; i < NumberOfHeaps; i++) {
         BaseHeapPage* page = m_heaps[i]->heapPageFromAddress(address);
         if (page) {
             // Asserts that make sure heapPageFromAddress takes addresses from
             // the whole aligned blinkPageSize memory area. This is necessary
             // for the negative cache to work.
             ASSERT(page->isLargeObject() || page == m_heaps[i]->heapPageFromAddress(roundToBlinkPageStart(address)));
             if (roundToBlinkPageStart(address) != roundToBlinkPageEnd(address))
                 ASSERT(page->isLargeObject() || page == m_heaps[i]->heapPageFromAddress(roundToBlinkPageEnd(address) - 1));
             ASSERT(!cachedPage || page == cachedPage);
             if (!cachedPage)
                 heapContainsCache()->addEntry(address, page);
             return page;
         }
     }
     ASSERT(!cachedPage);
     return 0;
 }
 
 void ThreadState::getStats(HeapStats& stats)
 {
     stats = m_stats;
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     if (isConsistentForGC()) {
         HeapStats scannedStats;
         scannedStats.clear();
         for (int i = 0; i < NumberOfHeaps; i++)
             m_heaps[i]->getScannedStats(scannedStats);
         ASSERT(scannedStats == stats);
     }
 #endif
 }
 
@@ skipping 177 matching lines @@
                 threadAttachMutex().unlock();
             return gcInfo;
         }
     }
     if (needLockForIteration)
         threadAttachMutex().unlock();
     return 0;
 }
 #endif
 }