[Bug target/115936] [15 Regression] GCN vs. ivopts: replace constant_multiple_of with aff_combination_constant_multiple_p [PR114932]

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115936

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
iv->step should never be a pointer type