anv: refresh cached current batch bo after emitting some commands

Fixes crashes in:
- Rise of the Tomb Rider (on benchmark start)
- Total War: Three Kingdoms (on game start)
- Total War: Warhammer II (on game start)

Fixes: 34a0ce58c7 ("anv: add a new execution mode for secondary command buffers")

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6546>

src/intel/vulkan/anv_batch_chain.c

@@ -951,6 +951,11 @@ anv_cmd_buffer_end_batch_buffer(struct anv_cmd_buffer *cmd_buffer)
                             .SecondLevelBatchBuffer = Firstlevelbatch) +
             (GEN8_MI_BATCH_BUFFER_START_BatchBufferStartAddress_start / 8);
          cmd_buffer->return_addr = anv_batch_address(&cmd_buffer->batch, jump_addr);
+
+         /* The emit above may have caused us to chain batch buffers which
+          * would mean that batch_bo is no longer valid.
+          */
+         batch_bo = anv_cmd_buffer_current_batch_bo(cmd_buffer);
       } else if ((cmd_buffer->batch_bos.next == cmd_buffer->batch_bos.prev) &&
                  (length < ANV_CMD_BUFFER_BATCH_SIZE / 2)) {
          /* If the secondary has exactly one batch buffer in its list *and*