anv: Simplify assertions related to graphics stages
In all three cases, COMPUTE was on the table but with an invalid value (zero). Drop it from the tables and the extra assertion, so if a COMPUTE is passed it will just fail the ARRAY_SIZE assertion.
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In all three cases, COMPUTE was on the table but with an invalid value (zero). Drop it from the tables and the extra assertion, so if a COMPUTE is passed it will just fail the ARRAY_SIZE assertion.