exp_attr.adb (Expand_N_Attribute_Reference): Rewrite the processing for Descriptor_Size.

exp_attr.adb (Expand_N_Attribute_Reference): Rewrite the processing for Descriptor_Size.

2011-09-06  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_attr.adb (Expand_N_Attribute_Reference): Rewrite the
	processing for Descriptor_Size.
	* gnat_rm.texi: Rephrase the wording for attribute Descriptor_Size
	to account for its broader usage.
	* sem_attr.adb (Analyze_Attribute): Change the error detection
	circuitry for Descriptor_Size as the attribute is now applicable
	to all types.

From-SVN: r178590