[llvm] [Offload] Allow "tagging" device info entries with offload keys (PR #147317)

[Ross Brunton via llvm-commits]

RossBrunton wrote:

@arsenm Going to merge this as is (using `find`). If you want any more changes, just ping me and I'll do them in a follow up task.

https://github.com/llvm/llvm-project/pull/147317