[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]

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jhuber6 wrote:

Why do we need these? We can create empty bitcode files inside the tests using `clang`. (Also I'm wondering if there's an existing empty bitcode file).

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