[Ada] Cleanup expansion of attribute Priority

Semantically neutral cleanup after the main fix for expansion of
attribute Priority.

gcc/ada/

	* einfo-utils.adb (Number_Entries): Refine type of a local variable.
	* exp_attr.adb (Expand_N_Attribute_Reference): Rename Conctyp to
	Prottyp; refactor repeated calls to New_Occurrence_Of; replace
	Number_Entries with Has_Entries.
	* exp_ch5.adb (Expand_N_Assignment_Statement): Likewise; remove Subprg
	variable (apparently copy-pasted from expansion of the attribute).

gcc/ada/einfo-utils.adb

@@ -2081,7 +2081,7 @@ package body Einfo.Utils is
    --------------------
 
    function Number_Entries (Id : E) return Nat is
-      N   : Int;
+      N   : Nat;
       Ent : Entity_Id;
 
    begin

gcc/ada/exp_attr.adb

@@ -5667,22 +5667,22 @@ package body Exp_Attr is
       --  which is illegal, because of the lack of aliasing.
 
       when Attribute_Priority => Priority : declare
-         Call           : Node_Id;
-         Conctyp        : Entity_Id;
-         New_Itype      : Entity_Id;
-         Object_Parm    : Node_Id;
-         Subprg         : Entity_Id;
-         RT_Subprg_Name : Node_Id;
+         Call        : Node_Id;
+         New_Itype   : Entity_Id;
+         Object_Parm : Node_Id;
+         Prottyp     : Entity_Id;
+         RT_Subprg   : RE_Id;
+         Subprg      : Entity_Id;
 
       begin
          --  Look for the enclosing protected type
 
-         Conctyp := Current_Scope;
-         while not Is_Protected_Type (Conctyp) loop
-            Conctyp := Scope (Conctyp);
+         Prottyp := Current_Scope;
+         while not Is_Protected_Type (Prottyp) loop
+            Prottyp := Scope (Prottyp);
          end loop;
 
-         pragma Assert (Is_Protected_Type (Conctyp));
+         pragma Assert (Is_Protected_Type (Prottyp));
 
          --  Generate the actual of the call
 
@@ -5710,7 +5710,7 @@ package body Exp_Attr is
             New_Itype := Create_Itype (E_Access_Type, N);
             Set_Etype (New_Itype, New_Itype);
             Set_Directly_Designated_Type (New_Itype,
-              Corresponding_Record_Type (Conctyp));
+              Corresponding_Record_Type (Prottyp));
             Freeze_Itype (New_Itype, N);
 
             --  Generate:
@@ -5745,15 +5745,16 @@ package body Exp_Attr is
 
          --  Select the appropriate run-time subprogram
 
-         if Number_Entries (Conctyp) = 0 then
-            RT_Subprg_Name := New_Occurrence_Of (RTE (RE_Get_Ceiling), Loc);
+         if Has_Entries (Prottyp) then
+            RT_Subprg := RO_PE_Get_Ceiling;
          else
-            RT_Subprg_Name := New_Occurrence_Of (RTE (RO_PE_Get_Ceiling), Loc);
+            RT_Subprg := RE_Get_Ceiling;
          end if;
 
          Call :=
            Make_Function_Call (Loc,
-             Name                   => RT_Subprg_Name,
+             Name                   =>
+               New_Occurrence_Of (RTE (RT_Subprg), Loc),
              Parameter_Associations => New_List (Object_Parm));
 
          Rewrite (N, Call);

gcc/ada/exp_ch5.adb

@@ -2392,11 +2392,10 @@ package body Exp_Ch5 is
 
       if Ada_Version >= Ada_2005 then
          declare
-            Call           : Node_Id;
-            Conctyp        : Entity_Id;
-            Ent            : Entity_Id;
-            Subprg         : Entity_Id;
-            RT_Subprg_Name : Node_Id;
+            Call      : Node_Id;
+            Ent       : Entity_Id;
+            Prottyp   : Entity_Id;
+            RT_Subprg : RE_Id;
 
          begin
             --  Handle chains of renamings
@@ -2418,36 +2417,25 @@ package body Exp_Ch5 is
 
                --  Look for the enclosing protected type
 
-               Conctyp := Current_Scope;
-               while not Is_Protected_Type (Conctyp) loop
-                  Conctyp := Scope (Conctyp);
+               Prottyp := Current_Scope;
+               while not Is_Protected_Type (Prottyp) loop
+                  Prottyp := Scope (Prottyp);
                end loop;
 
-               pragma Assert (Is_Protected_Type (Conctyp));
-
-               --  Generate the first actual of the call
-
-               Subprg := Current_Scope;
-               while
-                 not (Is_Subprogram_Or_Entry (Subprg)
-                      and then Present (Protected_Body_Subprogram (Subprg)))
-               loop
-                  Subprg := Scope (Subprg);
-               end loop;
+               pragma Assert (Is_Protected_Type (Prottyp));
 
                --  Select the appropriate run-time call
 
-               if Number_Entries (Conctyp) = 0 then
-                  RT_Subprg_Name :=
-                    New_Occurrence_Of (RTE (RE_Set_Ceiling), Loc);
+               if Has_Entries (Prottyp) then
+                  RT_Subprg := RO_PE_Set_Ceiling;
                else
-                  RT_Subprg_Name :=
-                    New_Occurrence_Of (RTE (RO_PE_Set_Ceiling), Loc);
+                  RT_Subprg := RE_Set_Ceiling;
                end if;
 
                Call :=
                  Make_Procedure_Call_Statement (Loc,
-                   Name => RT_Subprg_Name,
+                   Name                   =>
+                     New_Occurrence_Of (RTE (RT_Subprg), Loc),
                    Parameter_Associations => New_List (
                      New_Copy_Tree (First (Parameter_Associations (Ent))),
                      Relocate_Node (Expression (N))));