[Ada] Couple of small cleanups for Cloned_Subtype

[Ada] Couple of small cleanups for Cloned_Subtype

[Pierre-Marie de Rodat]

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No functional changes.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* exp_util.adb (Make_Subtype_From_Expr): Do not set field to Empty.
	* sem_util.adb (Visit_Itype): Remove ??? comment.

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diff --git a/gcc/ada/exp_util.adb b/gcc/ada/exp_util.adb
--- a/gcc/ada/exp_util.adb
+++ b/gcc/ada/exp_util.adb
@@ -10213,8 +10213,8 @@ package body Exp_Util is
 
       elsif Is_Class_Wide_Type (Unc_Typ) then
          declare
-            CW_Subtype : Entity_Id;
-            EQ_Typ     : Entity_Id := Empty;
+            CW_Subtype : constant Entity_Id :=
+                           New_Class_Wide_Subtype (Unc_Typ, E);
 
          begin
             --  A class-wide equivalent type is not needed on VM targets
@@ -10237,11 +10237,10 @@ package body Exp_Util is
                   Set_Etype (Unc_Typ, Base_Type (Full_View (Etype (Unc_Typ))));
                end if;
 
-               EQ_Typ := Make_CW_Equivalent_Type (Unc_Typ, E);
+               Set_Equivalent_Type
+                 (CW_Subtype, Make_CW_Equivalent_Type (Unc_Typ, E));
             end if;
 
-            CW_Subtype := New_Class_Wide_Subtype (Unc_Typ, E);
-            Set_Equivalent_Type (CW_Subtype, EQ_Typ);
             Set_Cloned_Subtype (CW_Subtype, Base_Type (Unc_Typ));
 
             return New_Occurrence_Of (CW_Subtype, Loc);


diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -25146,8 +25146,7 @@ package body Sem_Util is
          end if;
 
          --  If a record subtype is simply copied, the entity list will be
-         --  shared. Thus cloned_Subtype must be set to indicate the sharing.
-         --  ??? What does this do?
+         --  shared, so Cloned_Subtype must be set to indicate this.
 
          if Ekind (Itype) in E_Class_Wide_Subtype | E_Record_Subtype then
             Set_Cloned_Subtype (New_Itype, Itype);