[Ada] Fix compatiblity with 16-bit compilers

[Arnaud Charlet <charlet at adacore dot com>]

Tested on x86-linux, committed on mainline.

The constants Others_Value and All_Others_Value added in a-exexpr.adb
cause a problem for the GNAAMP compiler because their values (16#BEEF#) are     
outside the range of 16-bit signed integers.  Only the first hex digit needs    
to be changed, to something <= 8.
16#7EEF# is used instead as the "unlikely" pattern.

2004-12-07  Gary Dismukes  <dismukes@adacore.com>

	* 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).

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