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st/mesa: Upload new constants on alpha test change when lowered

Icecream95 requested to merge icecream95/mesa:alpha-state into master

nir_lower_alpha_test creates a uniform for the alpha reference value; this needs to be updated when changing alpha test state.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4390
Fixes: b1c4c4c7 ("mesa/gallium: automatically lower alpha-testing")

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