midgard: Fix type for vertex_builtin_arg().
It takes an intrinsic, not an ALU op. Fixes a clang complaint about enum conversion.
Fixes: 306800d7 ("pan/midgard: Lower gl_VertexID/gl_InstanceID to attributes")
It takes an intrinsic, not an ALU op. Fixes a clang complaint about enum conversion.
Fixes: 306800d7 ("pan/midgard: Lower gl_VertexID/gl_InstanceID to attributes")