[llvm] [Offload] Enable querying a kernel's program (PR #142632)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

At a minimum we'd want symbol address and size, then you can add stuff to that like whether or not it's a kernel or a global, you can probably refer to what CUDA / HSA provides as well.

https://github.com/llvm/llvm-project/pull/142632