make heap checking smarter in -fdebug mode
make heap checking smarter in -fdebug mode

darcs-hash:20070313022051-1a7c6-9a9ab91fb912863b350066e9ba0fe8746c595e85

kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc