PR middle-end/32457

	PR middle-end/32457
	* tree-data-ref.c (analyze_siv_subscript_cst_affine,
	compute_overlap_steps_for_affine_1_2, analyze_subscript_affine_affine,
	init_omega_for_ddr_1): Use non conservative number of iterations
	estimations.
	(analyze_subscript_affine_affine): Use HOST_WIDE_INT instead of int.
	(analyze_siv_subscript): Remove FIXME and reinitialization of
	last_conflicts to chrec_dont_know.
	* testsuite/gfortran.dg/vect/pr32457.f90: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@126305 138bc75d-0d04-0410-961f-82ee72b054a4