[llvm] [Offload] XFAIL four tests while working on fix (PR #98899)

[Jan Patrick Lehr via llvm-commits]

jplehr wrote:

Yeah, my bad, I forgot to link to the PR that caused the fails in the commit message.
https://github.com/llvm/llvm-project/pull/83131

There is an assertion error that we hit. Matt asked to produce IR before/after the patch, so I'm going to llvm-reduce these tests and provide it to him.

https://github.com/llvm/llvm-project/pull/98899