Comment # 10 on bug 97524 from Nicolai Hähnle

I can reproduce this now. It really seems like this should be fixed in Mesa
main, though: there is already code that checks for this condition when it
affects a single program stage (in _mesa_update_shader_textures_used) and when
it affects a SSO pipeline (in _mesa_sampler_uniforms_pipeline_are_valid). This
code needs to be hooked into the non-SSO case as well.