[llvm] [GVNSink] Fix incorrect codegen with respect to GEPs #85333 (PR #88440)

[via llvm-commits]

dyung wrote:

@hiraditya, the test you added seems to be failing on windows bots:

- https://lab.llvm.org/buildbot/#/builders/216/builds/38357
- https://lab.llvm.org/buildbot/#/builders/233/builds/9396
- https://lab.llvm.org/buildbot/#/builders/235/builds/7335

Can you take a look and revert if you need time to investigate?

https://github.com/llvm/llvm-project/pull/88440