exp_attr.adb (Expand_N_Attribute_Reference): Handle case of child unit

2007-08-14  Robert Dewar  <dewar@adacore.com>
	    Javier Miranda  <miranda@adacore.com>
	    Gary Dismukes  <dismukes@adacore.com>

	* exp_attr.adb (Expand_N_Attribute_Reference): Handle case of child unit
	(Expand_N_Attribute_Reference): Further unify the handling of the
	three forms of access attributes, using common code now for all three
	cases. Add a test for the case of applying an access attribute to
	an explicit dereference when the context is an access-to-interface
	type. In that case we need to apply the conversion to the prefix
	of the explicit dereference rather than the prefix of the attribute.
	(Attribute_Version, UET_Address): Set entity as internal to ensure
	proper dg output of implicit importation.
	(Expand_Access_To_Type): Removed.
	(Expand_N_Attribute_Reference): Merge the code from the three cases
	of access attributes, since the processing is largely identical for
	these cases. The substantive fix here is to process the case of a
	type name prefix (current instance case) before handling the case
	of interface prefixes.

From-SVN: r127416