[llvm] [offload][SYCL] Add SYCL Module splitting. (PR #131347)

[Maksim Sabianin via llvm-commits]

maksimsab wrote:

Even in our case in splitting by source unit it would be difficult to map module ids to integers. I could use a hash but it would lead to collisions.

https://github.com/llvm/llvm-project/pull/131347