winsys/amdgpu: add assert that if kernel fence passes then user fence must pass

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36700>

src/gallium/winsys/amdgpu/drm/amdgpu_cs.cpp

@@ -238,6 +238,9 @@ bool amdgpu_fence_wait(struct pipe_fence_handle *fence, uint64_t timeout,
                               abs_timeout, 0, NULL))
       return false;
 
+   if (user_fence_cpu)
+      assert(*user_fence_cpu >= afence->seq_no);
+
    afence->signalled = true;
    return true;
 }