2007-09-26  Robert Dewar  <dewar@adacore.com>

	* checks.adb, gnat1drv.adb, sem_util.ads: Improve warnings for address
	overlays.

	* sem_ch13.ads, sem_ch13.adb: Improve warnings for address overlays
	(Analyze_Record_Representation_Clause): Suppress junk warning for
	missing component clause.
	(Analyze_Attribute_Definition_Clause, case Address): Apply the special
	tests for controlled type overlay to composites with controlled
	components.
	(Analyze_Record_Representation_Clause): Add reference for component name

From-SVN: r128785