[llvm] [OFFLOAD] Restore interop functionality (PR #161429)

[Jan Patrick Lehr via llvm-commits]

jplehr wrote:

I re-tested this PR against the little test that I put up in #161434 on AMD and that test works.

>From my end, it is OK to go in as-is and we need to implement the missing functionality in the plugins.
In case someone has a strong opinion otherwise, I won't fight for that course of action.

https://github.com/llvm/llvm-project/pull/161429