llvmpipe: add compute pipeline statistics support.

This just adds the CS invocations counter.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>

src/gallium/drivers/llvmpipe/lp_query.c

@@ -291,7 +291,8 @@ llvmpipe_end_query(struct pipe_context *pipe, struct pipe_query *q)
          llvmpipe->pipeline_statistics.c_primitives - pq->stats.c_primitives;
       pq->stats.ps_invocations =
          llvmpipe->pipeline_statistics.ps_invocations - pq->stats.ps_invocations;
-
+      pq->stats.cs_invocations =
+         llvmpipe->pipeline_statistics.cs_invocations - pq->stats.cs_invocations;
       llvmpipe->active_statistics_queries--;
       break;
    case PIPE_QUERY_OCCLUSION_COUNTER:

src/gallium/drivers/llvmpipe/lp_state_cs.c

@@ -705,6 +705,7 @@ static void llvmpipe_launch_grid(struct pipe_context *pipe,
       lp_cs_tpool_wait_for_task(screen->cs_tpool, &task);
       mtx_unlock(&screen->cs_mutex);
    }
+   llvmpipe->pipeline_statistics.cs_invocations += num_tasks * info->block[0] * info->block[1] * info->block[2];
 }
 
 void