[Ada] Add Ada 2022 Key function to sets containers

[Ada] Add Ada 2022 Key function to sets containers

[Pierre-Marie de Rodat]

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This patch adds the new Generic_Keys.Key function to the set children
of Ada.Containers.

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

gcc/ada/

	* libgnat/a-cbhase.ads, libgnat/a-cborse.ads,
	libgnat/a-cihase.ads, libgnat/a-ciorse.ads,
	libgnat/a-cohase.ads, libgnat/a-coorse.ads (Key): New function
	that takes a Container parameter, implemented as an expression
	function, so it is self explanatory (doesn't need a comment).

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diff --git a/gcc/ada/libgnat/a-cbhase.ads b/gcc/ada/libgnat/a-cbhase.ads
--- a/gcc/ada/libgnat/a-cbhase.ads
+++ b/gcc/ada/libgnat/a-cbhase.ads
@@ -403,6 +403,9 @@ is
       --  Applies generic formal operation Key to the element of the node
       --  designated by Position.
 
+      function Key (Container : Set; Position : Cursor) return Key_Type is
+        (Key (Element (Container, Position)));
+
       function Element (Container : Set; Key : Key_Type) return Element_Type;
       --  Searches (as per the key-based Find) for the node containing Key, and
       --  returns the associated element.


diff --git a/gcc/ada/libgnat/a-cborse.ads b/gcc/ada/libgnat/a-cborse.ads
--- a/gcc/ada/libgnat/a-cborse.ads
+++ b/gcc/ada/libgnat/a-cborse.ads
@@ -262,6 +262,9 @@ is
 
       function Key (Position : Cursor) return Key_Type;
 
+      function Key (Container : Set; Position : Cursor) return Key_Type is
+        (Key (Element (Container, Position)));
+
       function Element (Container : Set; Key : Key_Type) return Element_Type;
 
       procedure Replace


diff --git a/gcc/ada/libgnat/a-cihase.ads b/gcc/ada/libgnat/a-cihase.ads
--- a/gcc/ada/libgnat/a-cihase.ads
+++ b/gcc/ada/libgnat/a-cihase.ads
@@ -389,6 +389,9 @@ is
       --  Applies generic formal operation Key to the element of the node
       --  designated by Position.
 
+      function Key (Container : Set; Position : Cursor) return Key_Type is
+        (Key (Element (Container, Position)));
+
       function Element (Container : Set; Key : Key_Type) return Element_Type;
       --  Searches (as per the key-based Find) for the node containing Key, and
       --  returns the associated element.


diff --git a/gcc/ada/libgnat/a-ciorse.ads b/gcc/ada/libgnat/a-ciorse.ads
--- a/gcc/ada/libgnat/a-ciorse.ads
+++ b/gcc/ada/libgnat/a-ciorse.ads
@@ -270,6 +270,9 @@ is
 
       function Key (Position : Cursor) return Key_Type;
 
+      function Key (Container : Set; Position : Cursor) return Key_Type is
+        (Key (Element (Container, Position)));
+
       function Element (Container : Set; Key : Key_Type) return Element_Type;
 
       procedure Replace


diff --git a/gcc/ada/libgnat/a-cohase.ads b/gcc/ada/libgnat/a-cohase.ads
--- a/gcc/ada/libgnat/a-cohase.ads
+++ b/gcc/ada/libgnat/a-cohase.ads
@@ -401,6 +401,9 @@ is
       --  Applies generic formal operation Key to the element of the node
       --  designated by Position.
 
+      function Key (Container : Set; Position : Cursor) return Key_Type is
+        (Key (Element (Container, Position)));
+
       function Element (Container : Set; Key : Key_Type) return Element_Type;
       --  Searches (as per the key-based Find) for the node containing Key, and
       --  returns the associated element.


diff --git a/gcc/ada/libgnat/a-coorse.ads b/gcc/ada/libgnat/a-coorse.ads
--- a/gcc/ada/libgnat/a-coorse.ads
+++ b/gcc/ada/libgnat/a-coorse.ads
@@ -263,6 +263,9 @@ is
 
       function Key (Position : Cursor) return Key_Type;
 
+      function Key (Container : Set; Position : Cursor) return Key_Type is
+        (Key (Element (Container, Position)));
+
       function Element (Container : Set; Key : Key_Type) return Element_Type;
 
       procedure Replace