nir_shader *shader = nir_shader_create(NULL, MESA_SHADER_VERTEX, NULL);
v = new register_coalesce_vec4_visitor(compiler, shader, prog_data);
nir_shader *shader = nir_shader_create(NULL, MESA_SHADER_VERTEX, NULL);
v = new register_coalesce_vec4_visitor(compiler, shader, prog_data);