Back out bug 368523 to test performance impact

xpcom/base/nsCycleCollector.cpp

@@ -946,7 +946,7 @@ nsCycleCollector::CollectWhite()
     if (ms2.lTotalCount < ms1.lTotalCount)
         mStats.mFreedBytes += (ms1.lTotalCount - ms2.lTotalCount);
 #endif // WIN32
-#endif // __MINGW32__
+#endif __MINGW32__
 }
 
 
@@ -1285,6 +1285,9 @@ InitMemHook(void)
     }
 }
 
+void (*__malloc_initialize_hook) (void) = InitMemHook;
+
+
 #elif defined(WIN32)
 #ifndef __MINGW32__
 
@@ -1595,11 +1598,6 @@ nsCycleCollector::Freed(void *n)
 {
     mStats.mFreeCalls++;
 
-    if (!n) {
-        // Ignore null pointers coming through
-        return;
-    }
-
     if (mPurpleBuf.Exists(n)) {
         mStats.mForgetNode++;
         mStats.mFreedWhilePurple++;