use device libs from AMDGPU_LLVM_Backend_jll - #1023
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The device libraries now ship with AMDGPU_LLVM_Backend_jll, built with a newer LLVM than Julia's. Downgrade their bitcode once with LLVMDowngrader_jll into a Scratch.jl-managed directory (keyed by the artifact tree hashes and the downgrade target), and drop the ROCmDeviceLibs_jll dependency. Assisted-by: Claude Code (claude-fable-5)
Julia 1.10 does not support opaque pointers, which our 15 target emits (LLVM 15 supported both opaque and typed). Alternative is we use typed pointers for 15 as a default as well
simeonschaub
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We downgrade these into a scratch space to be compatible with Julia's LLVM version
requires JuliaGPU/GPUCompiler.jl#894, JuliaGPU/GPUCompiler.jl#895 and for 1.10 support also JuliaLLVM/llvm-downgrade#7
ref #919 (comment)