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

	* 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.

From-SVN: r92835