60000690e1b24174d6ced3addce16d87be9bec40

Previously the flag to mark the differences for the alpha test function and reference value were conflated into one. However this is awkward when generating shader code to simulate the alpha testing for GLES 2 because in that case changing the function would need a different program but changing the reference value just requires updating a uniform. This patch makes the function and reference have their own state flags.
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