Upgrade modern backend to LLVM 21.1.8 and CUDA 13.3 - #3
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Upstream review: Rust-GPU#408
Upgrade the modern backend to LLVM 21.1.8 and CUDA 13.3, including feature selection, Nix tooling, LLVM downloads, and Linux/Windows CI configuration. Linux validation uses upstream LLVM release prebuilts and compiles the vector-add example.
This is the bottom of stack Rust-GPU#6:
main→experiment/cuda13.3-llvm21→poc/portable-ptx-export. The dependent portable PTX export work is in #4; this PR retains the existing six LLVM upgrade commits unchanged.Validation: branch ancestry verified against the current fork
main. The combined export backend requires fresh Linux CI validation; previous LLVM 19 workload results do not validate LLVM 21.LLVM archive override: the builder accepts
PREBUILT_LLVM_URLwith or without a trailing slash;USE_PREBUILT_LLVM=1forces its download path. Linux CI reads the repository variable of the same name and defaults to the fork's LLVM 21.1.8 release. All three release asset SHA-256 hashes match artifacts downloaded from run 34781677658 at commit 2cf27700bffbab35dff21a58d1e19ca12525ca6f. Archive layout was checked for each host platform. The guide documents the override.Active native stack: #3 → #7 → #8 → #9 → #10. Historical-report PR #11 is closed. Updated CI is pending.