ada: Fix couple of issues with arrays indexed by enumeration type
The first one is that Remove_Warning_Messages reinstates the Original_Node
of an N_Raise_Constraint_Error node in the tree for no clear reasons, and
the Original_Node may contain constructs whose expansion has been stopped
when the Constraint_Error was asserted, eventually causing gigi to stop.
The second one is that a path in Build_Array_Aggr_Code.Gen_Loop does not
copy the loop bounds, unlike other paths, thus triggering a sharing issue.
gcc/ada/
* errout.adb (Remove_Warning_Messages.Check_For_Warning): Do not
reinstate the Original_Node in the tree.
* exp_aggr.adb (Build_Array_Aggr_Code.Gen_Loop): Copy the bounds
on all paths.