message: [NFC] Remove all_gather_dimension from all-to-all in the unit test
diff: @@ -58,7 +58,7 @@ func @invalid_alltoall(%input0: memref<2xf32>, %output: memref<8xf32>) {
  "lmhlo.all_to_all"(%input0, %output)
  {channel_id = {handle = 1 : i64, type = 0 : i64}, constrain_layout = false,
  replica_groups = dense<[[0, 1, 2, 3], [5, 6, 7, 8]]> : tensor<2x4xi64>,
  - use_global_device_ids = false, all_gather_dimension = 0 : i64} : (memref<2xf32>, memref<8xf32>) -> ()
  + use_global_device_ids = false} : (memref<2xf32>, memref<8xf32>) -> ()
  return
  }
  @@ -69,7 +69,7 @@ func @invalid_alltoall(%input0: memref<2xf32>, %output: memref<8xf32>) {
  "lmhlo.all_to_all"(%input0, %output)
  {channel_id = {handle = 1 : i64, type = 0 : i64}, constrain_layout = false,
  replica_groups = dense<0> : tensor<1xi64>,
  - use_global_device_ids = false, all_gather_dimension = 0 : i64} : (memref<2xf32>, memref<8xf32>) -> ()
  + use_global_device_ids = false} : (memref<2xf32>, memref<8xf32>) -> ()
  return
  }
  