[Ada] Fix detection of unused warning suppression

["Marc Poulhiès" <poulhies@adacore.com>]

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The comment for Warnings_Off says: "clients should generally not test
this flag directly, but instead use function Has_Warnings_Off".

Primarily a code cleanup, as this only affects minor a corner case.

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

gcc/ada/

	* sem_ch13.adb (Validate_Unchecked_Conversions): Use
	Has_Warnings_Off.
	* sem_elab.adb (Check_Internal_Call_Continue): Likewise.

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diff --git a/gcc/ada/sem_ch13.adb b/gcc/ada/sem_ch13.adb
--- a/gcc/ada/sem_ch13.adb
+++ b/gcc/ada/sem_ch13.adb
@@ -17726,7 +17726,9 @@ package body Sem_Ch13 is
          begin
             --  Skip if function marked as warnings off
 
-            if Warnings_Off (Act_Unit) or else Serious_Errors_Detected > 0 then
+            if Has_Warnings_Off (Act_Unit)
+              or else Serious_Errors_Detected > 0
+            then
                goto Continue;
             end if;
 


diff --git a/gcc/ada/sem_elab.adb b/gcc/ada/sem_elab.adb
--- a/gcc/ada/sem_elab.adb
+++ b/gcc/ada/sem_elab.adb
@@ -18767,9 +18767,9 @@ package body Sem_Elab is
                      T : constant Entity_Id := Etype (First_Formal (E));
                   begin
                      if Is_Controlled (T) then
-                        if Warnings_Off (T)
+                        if Has_Warnings_Off (T)
                           or else (Ekind (T) = E_Private_Type
-                                    and then Warnings_Off (Full_View (T)))
+                                    and then Has_Warnings_Off (Full_View (T)))
                         then
                            goto Output;
                         end if;