[llvm] [Offload] Move RPC server handling to a dedicated thread (PR #112988)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

Bah, causes issues with NVIDIA's malloc somehow. I really need to replace that with `mmap()` + VM management so we don't randomly deadlock like this.

https://github.com/llvm/llvm-project/pull/112988