[SPIR-V] Expose an API call to initialize SPIRV target and translate input LLVM IR module to SPIR-V#107216

VyacheslavLevytskyy merged 6 commits intollvm:mainllvm/llvm-project:mainfrom

VyacheslavLevytskyy:spirv_backend_as_an_api_callVyacheslavLevytskyy/llvm-project:spirv_backend_as_an_api_callCopy head branch name to clipboard