IBM bug with multiple GPUs (#543)

Co-authored-by: Anand <[email protected]>

Author: anandrdbz

src/simulation/m_ibm.fpp

@@ -98,6 +98,8 @@ contains
         ! Get neighboring IB variables from other processors
         call s_mpi_sendrecv_ib_buffers(ib_markers, gp_layers)
 
+        !$acc update host(ib_markers%sf)
+
         call s_find_num_ghost_points()
 
         !$acc update device(num_gps, num_inner_gps)