Fix PR46194: fix the computation of distance vectors.

2011-02-04  Sebastian Pop  <sebastian.pop@amd.com>

	PR tree-optimization/46194
	* tree-data-ref.c (analyze_miv_subscript): Remove comment.
	(build_classic_dist_vector_1): Do not represent classic distance
	vectors when the access functions are variating in different loops.

	* gcc.dg/autopar/pr46194.c: New.

From-SVN: r169847