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[Ada] Remove internal debug flags -gnatd.X/-gnatd.Y

This patch removes the debug flags -gnatd.X and -gnatd.Y along with
the related Opt flag Use_Expression_With_Actions. This flag was for
temporary use as this feature was implemented. It is now fully
implemented, and we have no use for the flag, or for the special
code used in a few cases if the flag was False. No functional
effect, so no test needed.

Tested on x86_64-pc-linux-gnu, committed on trunk

2013-04-25  Robert Dewar  <dewar@adacore.com>

	* debug.adb: Remove d.X and d.Y entries and documentation.
	* exp_ch4.adb (Expand_N_If_Expression): Remove special code used
	if expression with actions not available (now always available).
	(Expand_Short_Circuit_Operator): Same change.
	* gnat1drv.adb (Adjust_Global_Switches) Remove setting
	Use_Expression_With_Actions flag, since this is now obsolete.
	* opt.ads (Use_Expression_Actions): Removed (always True now).
	* sinfo.ads: Minor comment updates.

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