radeonsi: check last_dirty_buf_counter in si_launch_grid
Otherwise compute dispatches may miss buffers invalidation. This fixes the test case from piglit!702 (both with and without GALLIUM_THREAD=0).
cc: mesa-stable
Otherwise compute dispatches may miss buffers invalidation. This fixes the test case from piglit!702 (both with and without GALLIUM_THREAD=0).
cc: mesa-stable