[clang] [Clang][SYCL] Introduce clang-sycl-link-wrapper to link SYCL offloading device code (Part 1 of many) (PR #112245)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Generally clang-based tools have dependencies on Clang. This tool does not (other than pulling the version number which could come from LLVM).

We can move this to `llvm` if it's a blocking issue, doesn't really make much of a difference (I forget if this patch adds it to the list of test dependencies, should do that as well)

https://github.com/llvm/llvm-project/pull/112245