re PR tree-optimization/55022 (air.f90 is miscompliled with -m64 -O2 -fgraphite-identity after revision 190619)

2014-04-14  Richard Biener  <rguenther@suse.de>

	PR middle-end/55022
	* fold-const.c (negate_expr_p): Don't negate directional rounding
	division.
	(fold_negate_expr): Likewise.

	* gcc.dg/graphite/pr55022.c: New testcase.

From-SVN: r209356