Merge pull request #2018 from bartoldeman/fix-dgemv-znver1-tree-vectorize

dgemv_kernel_4x4(Haswell): add missing clobbers for xmm0,xmm1,xmm2,xmm3

kernel/x86_64/dgemv_n_microk_haswell-4.c

@@ -104,6 +104,7 @@ static void dgemv_kernel_4x4( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT
           "r" (ap[3]),  // 7
           "r" (alpha)   // 8
 	: "cc", 
+	  "%xmm0", "%xmm1", "%xmm2", "%xmm3",
 	  "%xmm4", "%xmm5", 
 	  "%xmm6", "%xmm7", 
 	  "%xmm8", "%xmm9",