[llvm] [Offload] Improve `olDestroyQueue` logic (PR #153041)

[Ross Brunton via llvm-commits]

RossBrunton wrote:

@jhuber6 
> Aren't the queues already supposed to use resource pools?

Yes, but olReleaseQueue can't put them back into the pool until they are resolved.

https://github.com/llvm/llvm-project/pull/153041