2015-05-22  Robert Dewar  <dewar@adacore.com>

	* atree.adb, atree.ads, treepr.adb: Change name Needs_Actuals_Check to
	Check_Actuals.
	* exp_ch4.adb (Expand_N_Op_Expon): Optimize 2**x in modular
	and overflow cases.

From-SVN: r223538