[llvm] [InstCombine] Compare `icmp inttoptr, inttoptr` values directly (PR #107012)

[Marina Taylor via llvm-commits]

citymarina wrote:

> I think the open question here is:
> 
> > My last attempt #77832 broke hwasan buildbot. @vitalybuka Can you check this patch?
> 
> But maybe we can just land this and see what happens.

I interpreted @vitalybuka's removing themself from the review to indicate no plans to test this, but if that was incorrect let me know.

https://github.com/llvm/llvm-project/pull/107012