[libclc] [libclc] Add an option to build SPIR-V targets with the LLVM backend (PR #151347)

[Mike Lothian via cfe-commits]

FireBurn wrote:

Yeah, it looks like at least https://github.com/llvm/llvm-project/commit/638383cb7110469d652c75a58b42afc80e863574 is needed on 21 to make it work



https://github.com/llvm/llvm-project/pull/151347