Muon LLVM toolchain 2026-09-24 (d2f676d)

Prebuilt Muon LLVM install (llvm-muon/), built from d2f676d on Ubuntu 24.04 (glibc 2.39).

• Supports -riscv-stack-word-stride (radiance-kernels default MU_STACK_WORD_STRIDE=16).
• Includes libc++ headers in include/c++/v1, as scripts/llvm.sh installs them.

Used by ucb-bar/radiance-kernels via scripts/llvm_prebuilt.sh, which extracts it to llvm/llvm-muon.

llvm-muon.tar.xz: xz -9, md5 8b25da8981a6d93df4b8a8ea956cbfd2.