sem_ch3.adb (Process_Discriminants): diagnose redundant or improper null exclusion in a discriminant declaration

2008-08-06  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb (Process_Discriminants): diagnose redundant or improper
	null exclusion in a discriminant declaration

	* sem_ch8.adb (Analyze_Object_Renaming): diagnose null exclusion
	indicators when type is not an access type.

	* sem_ch12.adb (Formal_Object_Declaration): diagnose null exclusion
	indicators when type is not an access type.

From-SVN: r138765