2011-05-27  Richard Guenther  <rguenther@suse.de>

	PR middle-end/49189
	* fold-const.c (fold_unary_loc): Do not re-fold folding conversions
	of comparisons.

	* gnat.dg/bit_packed_array5.adb: New testcase.
	* gnat.dg/bit_packed_array5.ads: Likewise.

From-SVN: r174330