addOne

    fn addOne(self: *ArmCpuinfoImpl) void {
        if (self.have_fields == 4 and self.core_no < num_cores) {
            if (self.core_no > 0) {
                // Deduplicate the core info.
                for (self.cores[0..self.core_no]) |it| {
                    if (std.meta.eql(it, self.cores[self.core_no]))
                        return;
                }
            }
            self.core_no += 1;
        }
    }