[Ada] Length of empty array with bounds overflowing result type

[Eric Botcazou]

This patch removes an unwanted early conversion of range bounds to the
result type when testing whether a range is empty.  The extra conversion
may overflow and cause the check for empty range to return an incorrect
result, like in the attached testcase.

Tested on i586-suse-linux, applied on the mainline.


2008-11-07  Thomas Quinot  <quinot@adacore.com>

	* gcc-interface/trans.c (Attribute_to_gnu, case Attr_Length): Check
	for empty range in original base type, not converted result type.


2008-11-07  Thomas Quinot  <quinot@adacore.com>

	* gnat.dg/hyper_flat.adb: New test.


-- 
Eric Botcazou
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