[Ada] Sync wide Ada.String hashing units

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

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The Wide_Wide_Hash version of Ada.Strings.Hash was instantiated as a
library unit. Now all versions are instantiated in wrapper functions.

Minor inconsistency, spotted while cleaning up code for categorization
pragmas on instance units.

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

gcc/ada/

	* libgnat/a-stzhas.adb (Wide_Wide_Hash): Instantiate inside a
	wrapper function.
	* libgnat/a-stzhas.ads (Wide_Wide_Hash): Likewise; remove wrong
	comment, because this is indeed a RM unit, as described in Ada
	RM A.4.8 (1/3).

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diff --git a/gcc/ada/libgnat/a-stzhas.adb b/gcc/ada/libgnat/a-stzhas.adb
--- a/gcc/ada/libgnat/a-stzhas.adb
+++ b/gcc/ada/libgnat/a-stzhas.adb
@@ -29,8 +29,14 @@
 --                                                                          --
 ------------------------------------------------------------------------------
 
---  This package does not require a body, since it is an instantiation. We
---  provide a dummy file containing a No_Body pragma so that previous versions
---  of the body (which did exist) will not interfere.
+with System.String_Hash;
 
-pragma No_Body;
+function Ada.Strings.Wide_Wide_Hash
+  (Key : Wide_Wide_String) return Containers.Hash_Type
+is
+   use Ada.Containers;
+   function Hash_Fun is new System.String_Hash.Hash
+     (Wide_Wide_Character, Wide_Wide_String, Hash_Type);
+begin
+   return Hash_Fun (Key);
+end Ada.Strings.Wide_Wide_Hash;


diff --git a/gcc/ada/libgnat/a-stzhas.ads b/gcc/ada/libgnat/a-stzhas.ads
--- a/gcc/ada/libgnat/a-stzhas.ads
+++ b/gcc/ada/libgnat/a-stzhas.ads
@@ -13,13 +13,9 @@
 --                                                                          --
 ------------------------------------------------------------------------------
 
---  Is this really an RM unit? Doc needed???
-
 with Ada.Containers;
-with System.String_Hash;
 
 function Ada.Strings.Wide_Wide_Hash
-is new System.String_Hash.Hash
-  (Wide_Wide_Character, Wide_Wide_String, Containers.Hash_Type);
+  (Key : Wide_Wide_String) return Containers.Hash_Type;
 
 pragma Pure (Ada.Strings.Wide_Wide_Hash);