[Bug ipa/92394] operand_equal_p should compare as base+offset when comparing addresses

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92394

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
I don't like making operand_equal_p deviate more and more from "GENERIC"
syntactic compare to semantic one as "lossy" as GIMPLE.