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

[Maksim Sabianin via llvm-commits]

maksimsab wrote:

Hi @jhuber6 @frasercrmck @bader @asudarsa!
The previous issue with unresolved symbols has been resolved in this patch.

Please, share you feedback when convenient.

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