[Bug middle-end/71474] PRED_LOOP_IV_COMPARE wrongly calculates number of iterations of a loop

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71474

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 38670
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38670&action=edit
Candidate patch

Following patch uses loop upper_bound to make the # of iterations properly
estimated.