[PATCH] [Polly] Extract number of elements/iterations for a isl_set/isl_ast_node

[Johannes Doerfert]

Lnt shows that sometimes it is very costly to compute the loop bounds. So I figure we cannot compute it for every loop but only on demand.

However, we need a fast way to compute hasAtLeastOneIteration(isl_ast_node *For). Any thoughts?

http://reviews.llvm.org/D4988