Fix PR42181.

2009-12-14  Sebastian Pop  <sebastian.pop@amd.com>

	PR middle-end/42181
	* graphite-scop-detection.c (graphite_can_represent_scev): Handle more
	carefully PLUS_EXPR, MINUS_EXPR, and MULT_EXPR.

	* testsuite/gfortran.dg/graphite/pr42181.f90: New.

From-SVN: r155417