added haswell optimized kernel

kernel/x86_64/sgemv_t_4.c

@@ -34,6 +34,8 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "sgemv_t_microk_bulldozer-4.c"
 #elif defined(SANDYBRIDGE)
 #include "sgemv_t_microk_sandy-4.c"
+#elif defined(HASWELL)
+#include "sgemv_t_microk_haswell-4.c"
 #endif
 
 #define NBMAX 4096