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Thanks for reaching out!
In Joule's documentation it is not specified a list of the interrupt enabled pins. Nevertheless, we know that some of them are indeed compatible with this feature as can be seen in the thread you shared above. From that thread we know that at least pins 51, 53 and 55 are interrupt enabled.
If you are using mraa, just like the user on the other thread, I suggest you to contact mraa directly to ask them which of Joule's GPIOs they have enabled for interrupts on their library. Since they had to enable them on mraa’s source, they might be able to provide you the list of pins that support interrupts on mraa. You can contact them in https://github.com/intel-iot-devkit/mraa/issues.
I hope this information helps you,