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v3d: fix GFXH-930 workaround

Iago Toral requested to merge itoral/mesa:v3d_fix_gfxh930 into main

When we are reading any builtins like VertexID or InstanceID the hw requires the first attribute to be active. In the coordinate shader, however, it may have been DCEd, so we need to detect that case and program a dummy attribute in that scenario.

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