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Draft: Add instance-based dispatch AST infrastructure

Open Ruben Hensen requested to merge rhensen/sac2c:progressive-dispatch-clean into develop

Replace FUNDEF_WRAPPERTYPE (ntype*) with FUNDEF_INSTANCES (instances_t*) and FUNDEF_WRAPPER (node* back-reference) for progressive dispatch.

  • Add WrapperLink and Instances attribute types to ast.xml
  • Replace FUNDEF_WRAPPERTYPE attribute with FUNDEF_WRAPPER and FUNDEF_INSTANCES
  • Add FUNDEF flags: IsBaseTypeWrapperfun, IsZombieWrapper, JustSpecialisedInTUP
  • Remove UWT (Update Wrapper Types) and EWT (Extend Wrapper Types) traversals and their phase definitions in phase_sac2c.mac and phase_sac4c.mac
  • Add instances_t typedef to types.h
  • Add dispatch/instances.c to CMakeLists.txt, remove obsolete ct_fun.c, update_wrapper_type.c, extend_wrapper_types.c