* exp_ch4.adb (Expand_N_Type_Conversion): return immediately
from processing the type conversion when the node is
replaced by an N_Raise_Program_Error node.
* sem_ch6.adb (Designates_From_With_Type): New routine.
(Process_Formals): Since anonymous access types are no longer flagged
as from with types, traverse the designated type to determine whether
it is coming from a limited view.
* sem_res.adb: Remove with and use clauses for Sem_Ch10.
(Full_Designated_Type): Use Available_View to extract the non-limited /
full view of a type.