bugfix for windows

kernel/x86_64/sgemv_n_microk_sandy-4.c

@@ -357,7 +357,9 @@ static void sgemv_kernel_4x4( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT
           "r" (alpha)   // 8
 	: "cc", 
 	  "%xmm0", "%xmm1", 
+	  "%xmm2", "%xmm3", 
 	  "%xmm4", "%xmm5", 
+	  "%xmm6", "%xmm7", 
 	  "%xmm8", "%xmm9", "%xmm10", "%xmm11",
 	  "%xmm12", "%xmm13", "%xmm14", "%xmm15",
 	  "memory"