nir: add some macros to deal with c++ implicit casting rules
With that it's easier now to just or nir_variable_mode, but maybe there are other enums used like that in c++ code and we could make it work for those as well.
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With that it's easier now to just or nir_variable_mode, but maybe there are other enums used like that in c++ code and we could make it work for those as well.