Recent polyhedron regressions.

[Richard Guenther]

The automatic tester experienced reproducible runtime regressions for
nf and channel.

Changes that could have affected nf are revisions 111593:111631 (dot
product and some where changes).

Changes that could have affected channel are revisions 111702:111728,
  * dependency.c (gfc_check_element_vs_element): Revert last change.
(no middle-end changes that can be accounted for the change).

http://www.suse.de/~rguenther/polyhedron/

Richard.