bc09ec6962
Break down the counted_by calculations so that they correctly handle anonymous structs, which are specified internally as IndirectFieldDecls. Improves the calculation of __bdos on a different field member in the struct. And also improves support for __bdos in an index into the FAM. If the index is further out than the length of the FAM, then we return __bdos's "can't determine the size" value (zero or negative one, depending on type). Also simplify the code to use helper methods to get the field referenced by counted_by and the flexible array member itself, which also had some issues with FAMs in sub-structs.
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