[patch] for second problem in PR 18431

[Kazu Hirata]

Hi Zdenek,

> 	* tree-ssa-loop-niter.c (upper_bound_in_type, lower_bound_in_type):
> 	Export.
> 	* tree.h (upper_bound_in_type, lower_bound_in_type): Declare.

You might want to move upper_bound_in_type and lower_bound_in_type to
fold-const.c or some other appropriate place.  It seems a bit strange
to me that functions in fold-const.c are calling functions in
tree-ssa-loop-niter.c.

Kazu Hirata