[clang] [Clang][SYCL] Add AOT compilation support for Intel GPUs in clang-sycl-linker (PR #133194)

[Alexey Bader via cfe-commits]

bader wrote:

> I'm wondering though, is there a reason we can't just use the backend right now? What do these tools do that running `llc` can't.

These tools compile programs in SPIR-V to the format that can be consumed by Intel's OpenCL/Level Zero drivers. `llc` can't do that because there are no Intel OpenCL specific transformation passes and Intel GPU backend.

https://github.com/llvm/llvm-project/pull/133194