sem_ch10.adb (Install_Withed_Unit): If the unit is a generic instance that is the parent of other generics...
* sem_ch10.adb (Install_Withed_Unit): If the unit is a generic instance
that is the parent of other generics, the instance body replaces the
instance node. Retrieve the instance of the spec, which is the one
that is visible in clients and within the body.
From-SVN: r47906
