[Ada] Remove hardcoded pragma Warnings from the formal vectors library

[Ada] Remove hardcoded pragma Warnings from the formal vectors library

[Pierre-Marie de Rodat]

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Pragma Warnings in the generic formal vectors library was only
suppressing a message in one specific instantiation within one specific
GNATprove test.  This pragma was referring to "type T defined at line
4", which is exactly the type declared in that test; the suppression
didn't work for any other instantiations.

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

gcc/ada/

	* libgnat/a-cofove.adb (Insert_Space): Remove hardcoded pragma
	Warnings.

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diff --git a/gcc/ada/libgnat/a-cofove.adb b/gcc/ada/libgnat/a-cofove.adb
--- a/gcc/ada/libgnat/a-cofove.adb
+++ b/gcc/ada/libgnat/a-cofove.adb
@@ -868,11 +868,7 @@ is
             --  less than 0, so it is safe to compute the following sum without
             --  fear of overflow.
 
-            pragma Warnings
-              (Off, "value not in range of type ""T"" defined at line 4");
             Index := No_Index + Index_Type'Base (Count_Type'Last);
-            pragma Warnings
-              (On, "value not in range of type ""T"" defined at line 4");
 
             if Index <= Index_Type'Last then