[SAFS]: replace valloc with posix_memalign for larger mem alloc.
[SAFS]: replace valloc with posix_memalign for larger mem alloc.

icoming/FlashX,icoming/FlashX,zheng-da/FlashX,icoming/FlashX,icoming/FlashX,icoming/FlashGraph,flashxio/FlashX,zheng-da/FlashX,flashxio/FlashX,silky/FlashGraph,icoming/FlashX,zheng-da/FlashX,flashxio/FlashX,zheng-da/FlashX,icoming/FlashGraph,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX,zheng-da/FlashX,silky/FlashGraph,icoming/FlashGraph,icoming/FlashGraph,silky/FlashGraph,silky/FlashGraph,silky/FlashGraph,icoming/FlashGraph