[Bug tree-optimization/90450] Hash function in gather_mem_refs_stmt does not match with mem_ref_hasher::equal

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90450

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 46389
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46389&action=edit
patch

The attached should fix the issue.  Martin?