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freq-ctr struct is used by the shm_stats_file API, and more precisely, it is used in the shm_stats_file_object struct for counters. shm_stats_file_object struct requires to be plateform-independent, thus we switch to using explicit size types (AKA fixed width integer types) for freq-ctr, in the attempt to make freq-ctr size and memory mapping consistent from one platform to another. We cannot simply use fixed-width integer because some of them are involved in atomic operations, and forcing a given width could cause build issues on some platforms where atomic ops are not implemented for large integers. Instead we leverage the FIXED_SIZE macro to keep handling the integers as before, but forcing them to be stored using expected number of bytes (unused bytes will simply be ignored). No change of behavior should be expected.