[Ada] Remove obsolete uses of Unchecked_Conversion from Ada 83

Similar to a recent removal of obsolete uses of Unchecked_Deallocation.

In Ada 83 the Unchecked_Conversion was a top-level unit; since Ada 95 it
is an obsolete renaming of Ada.Unchecked_Conversion. GNAT doesn't warn
yet about uses of these obsolete renamings, but it still seems better to
avoid them.

gcc/ada/

	* atree.adb, gen_il-gen.adb, osint.adb, set_targ.adb,
	sinput.adb, table.adb, treepr.adb, types.ads: Replace uses of
	Unchecked_Conversion in the compiler itself.
	* libgnarl/a-reatim.adb, libgnarl/s-osinte__gnu.ads,
	libgnarl/s-osinte__kfreebsd-gnu.ads, libgnat/a-coboho.adb,
	libgnat/a-stuten.ads, libgnat/s-putima.adb: Likewise in the
	runtime.
	* doc/gnat_ugn/gnat_and_program_execution.rst: Likewise in
	documentation.
	* gnat_ugn.texi: Regenerate.

1 files changed, 6 insertions, 6 deletions

diff --git a/gcc/ada/sinput.adb b/gcc/ada/sinput.adb
index fccbacf..8e80213 100644
--- a/gcc/ada/sinput.adb
+++ b/gcc/ada/sinput.adb
@@ -41,8 +41,8 @@ with System.Storage_Elements;
 with System.Memory;
 with System.WCh_Con; use System.WCh_Con;
 
+with Ada.Unchecked_Conversion;
 with Ada.Unchecked_Deallocation;
-with Unchecked_Conversion;
 
 package body Sinput is
 
@@ -56,16 +56,16 @@ package body Sinput is
    --  used to construct improperly aliased pointer values.
 
    function To_Address is
-     new Unchecked_Conversion (Lines_Table_Ptr, Address);
+     new Ada.Unchecked_Conversion (Lines_Table_Ptr, Address);
 
    function To_Address is
-     new Unchecked_Conversion (Logical_Lines_Table_Ptr, Address);
+     new Ada.Unchecked_Conversion (Logical_Lines_Table_Ptr, Address);
 
    function To_Pointer is
-     new Unchecked_Conversion (Address, Lines_Table_Ptr);
+     new Ada.Unchecked_Conversion (Address, Lines_Table_Ptr);
 
    function To_Pointer is
-     new Unchecked_Conversion (Address, Logical_Lines_Table_Ptr);
+     new Ada.Unchecked_Conversion (Address, Logical_Lines_Table_Ptr);
 
    pragma Warnings (On);
 
@@ -378,7 +378,7 @@ package body Sinput is
       --  to first Unchecked_Convert to access-to-variable.
 
       function To_Source_Buffer_Ptr_Var is new
-        Unchecked_Conversion (Source_Buffer_Ptr, Source_Buffer_Ptr_Var);
+        Ada.Unchecked_Conversion (Source_Buffer_Ptr, Source_Buffer_Ptr_Var);
 
       Temp : Source_Buffer_Ptr_Var := To_Source_Buffer_Ptr_Var (Src);