a-exexpr.adb (Others_Value, [...]): Change initial values from 16#BEEF# to 16#7FFF# to avoid exceeding Integer'Last...

	* a-exexpr.adb (Others_Value, All_Others_Value): Change initial values
	from 16#BEEF# to 16#7FFF# to avoid exceeding Integer'Last on 16-bit
	targets (such as AAMP).

From-SVN: r91874