re PR middle-end/52621 (ICE with -O3 -march=opteron in initialize_matrix_A, at tree-data-ref.c:1964)

2012-04-11  Richard Guenther  <rguenther@suse.de>

	PR middle-end/52621
	* tree-chrec.c (evolution_function_is_invariant_rec_p): Properly
	consider loop nesting.
	(evolution_function_is_univariate_p): Properly check the remainder
	for chrecs.

	* gfortran.dg/pr52621.f90: New testcase.

From-SVN: r186321