mmsubstate is a synthetic peripheral which uses a LED to create well-defined
power sub-states in select power states.

Or rather: TODO: make stdin/stdout configurable so it also works for eUSCI_A1.

AspectC++ is not aware of the type "__int20", so we need to map it to a type
known to AspectC++ (only for ag++, not g++) and fix its autogenerated
constructor signatures.