[Ada] Make parent of N_Exception_Declaration be N_Declaration

[Ada] Make parent of N_Exception_Declaration be N_Declaration

[Pierre-Marie de Rodat]

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The parent was Node_Kind before. This is a minor cleanup, and has no
effect on the operation of the compiler.  However, if we start declaring
more objects of the various predicated subtypes, such as
N_Declaration_Id, it would be good to get them right.

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

gcc/ada/

	* gen_il-gen-gen_nodes.adb: Change the parent of
	N_Exception_Declaration to be N_Declaration.  Minor comment fix.

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diff --git a/gcc/ada/gen_il-gen-gen_nodes.adb b/gcc/ada/gen_il-gen-gen_nodes.adb
--- a/gcc/ada/gen_il-gen-gen_nodes.adb
+++ b/gcc/ada/gen_il-gen-gen_nodes.adb
@@ -573,7 +573,7 @@ begin -- Gen_IL.Gen.Gen_Nodes
 
    Ab (N_Declaration, Node_Kind);
    --  Note: this includes all constructs normally thought of as declarations
-   --  except those which are separately grouped as later declarations.
+   --  except those that are separately grouped in N_Later_Decl_Item.
 
    Cc (N_Component_Declaration, N_Declaration,
        (Sy (Defining_Identifier, Node_Id),
@@ -1342,7 +1342,7 @@ begin -- Gen_IL.Gen.Gen_Nodes
        (Sy (Defining_Identifier, Node_Id),
         Sy (Discrete_Subtype_Definition, Node_Id, Default_Empty)));
 
-   Cc (N_Exception_Declaration, Node_Kind,
+   Cc (N_Exception_Declaration, N_Declaration,
        (Sy (Defining_Identifier, Node_Id),
         Sm (Expression, Node_Id),
         Sm (More_Ids, Flag),