back_end.adb: Remove Short_Enums handling (handled in Ttypes/Get_Targ now) Minor...

back_end.adb: Remove Short_Enums handling (handled in Ttypes/Get_Targ now) Minor added comments.

2014-01-24  Robert Dewar  <dewar@adacore.com>

	* back_end.adb: Remove Short_Enums handling (handled in
	Ttypes/Get_Targ now) Minor added comments.
	* freeze.adb: Change name Short_Enums_On_Target to
	Target_Short_Enums.
	* get_targ.ads, get_targ.adb (Get_Short_Enums): New function.
	* opt.ads: Minor comment updates.
	* sem_ch13.adb: Change name Short_Enums_On_Target to
	Target_Short_Enums.
	* set_targ.adb: Set Short_Enums from gcc back end.
	* set_targ.ads (Short_Enums): New variable.
	* targparm.ads, targparm.adb: Remove Short_Enums entries (handled in
	Ttypes/Get_Targ now).
	* ttypes.ads (Target_Short_Enums): New constant boolean switch

From-SVN: r207045