MAGIC2
ASSERT(fFreeList->magic2 == MAGIC2 + (uint32)(addr_t)fFreeList->next);
DEBUG_ONLY(block->magic2 = MAGIC2 + (uint32)(addr_t)block->next);
DEBUG_ONLY(block->magic2 = MAGIC2 + (uint32)(addr_t)block->next);
ASSERT(fFreeList->magic2 == MAGIC2 + (uint32)(addr_t)fFreeList->next);