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Add a pointer_initializer field to nir_variable analogous to constant_initializer, which can be used to initialize the nir_variable to a pointer to another nir_variable. Just like the constant_initializer, the pointer_initializer gets eliminated in the nir_lower_constant_initializers pass. Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com> Part-of: <mesa/mesa!3047>
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