This seem like the wrong way to go about it. In particular, I think this is what we should do:
- Make struct sm4_register a proper subset of struct vkd3d_shader_register. E.g. by changing the "type" field from vkd3d_sm4_register_type to vkd3d_shader_register_type. It probably also implies moving some fields from struct sm4_register to struct sm4_dst_register/sm4_src_register.
- Replace usage of struct sm4_register with usage of struct vkd3d_shader_register. That should be straightforward after the previous step.
- Move up from there. I.e., doing the same thing for struct sm4_dst_register, struct sm4_src_register, and struct sm4_instruction. It's possible that this will require adding things to the vkd3d_shader_instruction structures; that's fine.