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[Ada] Make sure gnat pragmas are recognized properly


This patch ensures that all gnat pragmas are properly marked so that
pragma Restrictions (No_Implementation_Pragmas) works as shown in the
following output:

     1. pragma Restrictions (No_Implementation_Pragmas);
     2. pragma Wide_Character_Encoding (UTF8);
        |
        >>> violation of restriction
            "no_implementation_pragmas" at line 1

     3. package gnat_pragmas is
     4. end gnat_pragmas;

This program compiled silently before the patch

Tested on i686-pc-linux-gnu, committed on trunk

2008-08-01  Robert Dewar  <dewar@adacore.com>

	* sem_prag.adb (Analyze_Pragma): Put entries in alpha order
	(Analyze_Pragma): Make sure all GNAT pragmas call GNAT_Pragma

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