[Ada] Fix uninitialized variable

[Arnaud Charlet <charlet at adacore dot com>]

Tested on x86-linux, committed on mainline.

Fix off-by-one and uninitialized variable errors found by code reading and
by building the compiler itself with checks (i.e. no -gnatp) enabled.

2005-01-03  Ed Schonberg  <schonberg@adacore.com>
	    Vincent Celier  <celier@adacore.com>

	* exp_aggr.adb (Packed_Array_Aggregate_Handled): The values of the
	bounds can be negative, and must be declared Int, not Nat.

	* sem_elim.adb (Line_Num_Match): Correct wrong code when index in an
	array is checked after using the index in the array.

	* makegpr.adb (Add_Switches): Check if there is a package for the
	processor. If there is no package, do not look for switches.

Attachment: difs.8
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