[Bug tree-optimization/65258] Wrong array bounds warning

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65258

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 34921
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34921&action=edit
untested patch

Patch to add additional asserts and to better handle UNDEFINED in propagation.