Eliminate libcfa-build warnings of missing int-to-pointer casts.
Replace a zero_t variable use with literal 0 when it's an argument to an intrinsic and we're generating final C code. Partially revert e0330d2cd1a. Such intrinsics are initialization/assignment of pointers; using the variable implies a missing cast, while using literal 0 needs no cast.
CodeGenerator.hpp
CodeGenerator.cpp
Put attibute unused on all zero_t/one_t object decls. It is needed on those whose uses are rewritten by the rule above.
Generate.cpp