[Ada] Remove unnecessary guards for appending non-empty lists

[Pierre-Marie de Rodat <derodat@adacore.com>]

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Calls to Append_List and Append_List_To applied with empty lists do
nothing, so there is no need to explicitly guard against such calls.

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

gcc/ada/

	* exp_ch3.adb (Build_Init_Procedure): Remove unnecessary guard.
	* exp_disp.adb (Make_DT): Likewise.
	* sem_ch12.adb (Analyze_Associations): Likewise.

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diff --git a/gcc/ada/exp_ch3.adb b/gcc/ada/exp_ch3.adb
--- a/gcc/ada/exp_ch3.adb
+++ b/gcc/ada/exp_ch3.adb
@@ -2885,9 +2885,7 @@ package body Exp_Ch3 is
                   Fixed_Comps    => False,
                   Variable_Comps => True);
 
-               if Is_Non_Empty_List (Init_Tags_List) then
-                  Append_List_To (Body_Stmts, Init_Tags_List);
-               end if;
+               Append_List_To (Body_Stmts, Init_Tags_List);
             end if;
          end if;
 


diff --git a/gcc/ada/exp_disp.adb b/gcc/ada/exp_disp.adb
--- a/gcc/ada/exp_disp.adb
+++ b/gcc/ada/exp_disp.adb
@@ -6379,9 +6379,7 @@ package body Exp_Disp is
                New_List (New_Occurrence_Of (DT_Ptr, Loc))));
       end if;
 
-      if not Is_Empty_List (Elab_Code) then
-         Append_List_To (Result, Elab_Code);
-      end if;
+      Append_List_To (Result, Elab_Code);
 
       --  Populate the two auxiliary tables used for dispatching asynchronous,
       --  conditional and timed selects for synchronized types that implement


diff --git a/gcc/ada/sem_ch12.adb b/gcc/ada/sem_ch12.adb
--- a/gcc/ada/sem_ch12.adb
+++ b/gcc/ada/sem_ch12.adb
@@ -2248,9 +2248,7 @@ package body Sem_Ch12 is
       --  explicit box associations for the formals that are covered by an
       --  Others_Choice.
 
-      if not Is_Empty_List (Default_Formals) then
-         Append_List (Default_Formals, Formals);
-      end if;
+      Append_List (Default_Formals, Formals);
 
       return Assoc_List;
    end Analyze_Associations;