[SYCL][NATIVECPU] Emit LocalInvocationId free function on Native CPU (#12810)
Similarly to the CUDA and Hip backends, the Native CPU pass pipeline
expects the work item builtins to be of the "free function" kind, this
PR ensures that for code that goes through `parallel_for_work_group`.
This PR fixes the `e2e/Basic/accessor/accessor.cpp` test on Native CPU.