sem_ch3.adb (Analyze_Subtype_Declaration): Inherit Is_Generic_Actual_Type flag...

sem_ch3.adb (Analyze_Subtype_Declaration): Inherit Is_Generic_Actual_Type flag in a nested instance.

2013-01-29  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb (Analyze_Subtype_Declaration): Inherit
	Is_Generic_Actual_Type flag in a nested instance.
	* sem_ch12.adb (Restore_Private_Views): Preserve
	Is_Generic_Actual_Type flag if actual is a Generic_Actual_Type
	of an enclosing instance.
	* sem_util.adb (Corresponding_Generic_Type): Handle generic actual
	which is an actual of an enclosing instance.
	* sem_type.adb (Real_Actual): If a generic_actual_type is the
	formal of an enclosing generic and thus renames the corresponding
	actual, use the actual of the enclosing instance to resolve
	spurious ambiguities in instantiations when two formals are
	instantiated with the same actual.

From-SVN: r195538